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Power Meters

Kinetic inRide with Heart Rate Monitor
$133.99
Benefit from tracking the most interesting, accurate, valuable, motivating and fun information while you're riding your Kurt Kinetic trainer, with their inRide Watt Meter. It uses your iPhone or iPad's Bluetooth communication technology to pair a power sensor pod and heart-rate monitor with Kinetic's inRide iPhone app so you can track your wattage with any Kinetic fluid trainer (smartphones and trainers sold separately). Tailor your workouts to meet your riding goals by logging your entire workout history, and even email your data to a coach for analysis and training planning. With the easy-to-install sensor and quick-download app, you'll be rolling and logging data in no time.
SRAM RED Quarq Power Meter Crankset
$2,576.99
If you're not using a power meter and tracking your watts, then you're giving the competition an advantage. SRAM's brilliantly stiff, light RED cranks feature a Quarq Power Meter integrated into the crank for easy installation, low weight, and minimal maintenance. Your power info is transmitted ANT+ wirelessly, enabling you to use the head unit of your choice (sold separately), and with no wires or external sensors, your beautifully sleek road machine stays clutter-free. Other nice features include an easily replaced battery and a wattage reading accuracy of +/- 1.5%. Also, calibration values are stoRED in the CinQo so there's no need to re-calibrate if you switch head units or swap chainrings. Plus, since the power sensor is in the crank, you can easily switch wheels. In addition, SRAM's X Glide R chainrings deliver world-class front shifts, and the oversize carbon arms transfer every watt of your strength.
SRAM XX1 Eagle Quarq Power Meter Crankset
$1,530.00
The SRAM XX1 Eagle Power Meter unites Quarq's DZero power meter platform with carbon tuned crank arms for robust, intuitive power measurement in the lightest ever chassis. The DZero platform embodies 10 years of Quarq's technology advances and adds new features such as dual Bluetooth low energy and ANT+ wireless data transfer, and the Qalvin BLE app. The companion X-SYNC 2 chainrings are designed specifically for Eagle chains and drivetrains. - BB Included: No - Chainring BCD: 104 - Chainrings sold separately
Garmin Vector Replacement Pedal Pod
$205.99
Garmin's Vector Replacement Pedal Pod replaces your old worn-out one for accurate power measurement and countless miles of more riding. • Standard: fits crank arms 15-18mm thick and up to 44mm wide • Large: fits crank arms 12-15mm thick and up to 44mm wide • ANT+ transmitter • User-replaceable battery (2032 coin cell) • 175 hours of active cycling operation • Compatible with Vector and Vector S • Replacing a pedal pod does not impact Vector power or cadence accuracy • Single pod only
Sigma Sport Rox 10.0 GPS
$240.99
Sigma's Rox 10.0 will take you to the ends of the earth! Sporting GPS and route navigation, the Rox 10.0’s cutting edge technology gives you all the ride information you crave. Speed, distance, and time functions are just the beginning with this computer. For climbing days you get a host of functions like gradient, altitude, and a profile of the next three miles. The array of lap functions provides the perfect tools for races and intervals. The data log, docking station, and Data Center software make tracking your rides simple and easy. Plus, the Rox 10.0 is ANT+ compatible and will communicate with power meters, heart rate straps, and cadence sensors.
SRAM RED 22 Quarq Power Meter Crankset (No Chainrings)
$1,785.99 - $1,830.99
The RED 22 Quarq Power Meter Crankset takes SRAM's brilliantly stiff, incredibly light RED cranks and marries them to an integrated, ultra-precise Quarq Power Meter for feathery low weight and accurate power measurement. In addition to those remarkable feats, it also delivers the the incredible power transfer of SRAM's hollow Exogram carbon crankarms. Feel every watt course through the crank and propel you forward, while every iota of your strength is recorded with an accuracy of +/- 1.5%. And, to make setup as easy as possible it features an easily accessible, weather-tight battery compartment.
Quarq ELSA 10R Power Meter Crankset
$2,499.99 - $2,576.99
To reach your potential as a cyclist, it's a great idea to train with a power meter, and the Quarq ELSA brings together incredible accuracy and superb performance in a wireless, crank-based unit. It uses ANT+ wireless technology to pair with a head unit of your choice (sold separately), to display and record your data. Plus, an LED indicator lets you know you've correctly synced the ELSA with your head unit. And, the user-replaceable battery is a simple to swap and readily available CR2032. With the ELSA's excellent accuracy you get great data, even if you swap chainrings, thanks to Quarq's Omnical technology, and with their Power Balance, the ELSA also uses algorithms to determine the independent power from each of your legs, on the fly. Plus, the SRAM-made Exogram hollow carbon crankarms and precision-shifting 5-bolt chainrings will leave you floored by their lightness, stiffness and beauty.
Quarq ELSA RS Power Meter Crankset
$2,006.99
Consistency and accuracy in training lead to better results, which is why using a consistently accurate and reliable power meter is vital. Quarq power meters using Quarq technology, measure power at the crankset spider. This the best place on the bike to measure power because all of your pedaling effort flows directly through the spider and it can be measured with great precision. Quarq's Active Temperature Compensation, which is calibrated with over 10,000 data points, makes their ELSA RS Power Meter Crankset accurate to within 1.5% (strain gauges benefit from accurate temperature). Plus the ELSA RS is specifically designed to match Shimano's 4-bolt Hollowglide chainrings for a seamless junction between ring and chassis. Quarq's Exogram Hollow Carbon crankarms deliver every watt to the road while keeping the weight incredibly low. ANT+ technology lets you hook up your desired compatible head unit, the LED indicator flashes when the power meter is on, and the single, easily-replaced CR2032 battery lasts for up to 300 hours of ride time. - Compatible with 11-speed Shimano chainrings (Dura-Ace, Ultegra, and 105) - Chainrings and bottom bracket are sold separately - Requires ANT+ head unit (sold separately) - 616 grams (GXP, 172.5mm) - Battery life: 300 hours
Quarq ELSA R 130 BCD Power Meter Crankset
$1,874.99 - $1,918.99
Consistency in training leads to better results, which is why using a consistently accurate and reliable power meter is vital. Quarq's Active Temperature Compensation, which is calibrated with over 10,000 data points, makes their ELSA R accurate to within 1.5%. Quarq's Exogram Hollow Carbon crankarms deliver every watt to the road while keeping the weight incredibly low. ANT+ technology lets you hook up your desired compatible head unit (sold separately), the LED indicator flashes when the power meter is on, and the single, easily replaced CR2032 battery lasts for up to 300 hours of ride time. - Compatible with 10/11-speed SRAM, Shimano (10-speed only) Rotor, FSA, Praxis, WickWerks, and other chainrings - Chainrings and bottom bracket are sold separately - 130 BCD
Quarq Riken R 130 BCD Power Meter Crankset
$1,558.99
Consistency in training leads to better results, which is why using a consistently accurate and reliable power meter is vital. Quarq's Active Temperature Compensation, which is calibrated with over 10,000 data points, makes their ELSA R accurate to within 1.5%. Carbon crankarms deliver the power to the road and keep the Riken light on the climbs. ANT+ technology lets you hook up your desired compatible head unit (sold separately), the LED indicator flashes when the power meter is on, and the single, easily replaced CR2032 battery lasts for up to 300 hours of ride time. - Compatible with 10/11-speed SRAM, Shimano (10-speed only) Rotor, FSA, Praxis, WickWerks, and other chainrings - Chainrings and bottom bracket are sold separately - 130 BCD
Quarq RIKEN 10R Power Meter Crankset
$2,333.99 - $2,416.99
To reach your maximum potential as a cyclist, it's a great idea to train with a power meter, and the Quarq RIKEN brings together excellent accuracy and performance in a wireless, crank-based unit. It uses ANT+ wireless technology to pair with a head unit of your choice (sold separately), to display and record your ride data. Plus, an LED indicator lets you know you've correctly synced the RIKEN with your head unit. And, the user-replaceable battery is a simple to swap and readily available CR2032. With the RIKEN's excellent accuracy you get extremely useful data, even if you swap chainrings, thanks to Quarq's Omnical technology. Plus, the SRAM-made carbon crankarms and 5-bolt precision-shifting chainrings will leave you floored by their unreal stiffness and beauty.
SRAM RED Quarq Power Meter Crankset
$1,387.00 - $1,464.99
The crankset is the heart of your bicycle and where you’ll find the SRAM RED Quarq power meter. The sole job of the crankset is to convert the effort from both legs to forward motion. It is the perfect place to measure power. This power meter works for every discipline: Road, triathlon, time trial, and cyclo-cross. The chainrings are replaceable should your bike, discipline, or ability change. - A direct force power meter that measures total power output from both legs with +/-1.5% accuracy - Works for every discipline: Road, triathlon, time trial, and cyclo-cross - No compromises on materials, shifting, wheels, or pedal choice - Proven by pro teams and athletes throughout the world – Cobbled Classics, Giro d’Italia, Tour de France, Vuelta a España, World Championships - Number 1 at the Ironman World Championship for the last three years - Uses a hidden bolt to mount the chainrings – compatible SRAM chainrings ensure the derailment pin lines up behind the crank arm - 10K – programmed with over 10,000 data points to eliminate temperature effects on power measurement - AxCad – A multi-axis accelerometer switches the power meter on and measures cadence, simplifying installation and operation - Breakthrough Materials – Exogram hollow carbon fiber crank arms – the lightest, strongest crank arms SRAM makes – minimize weight and maximize speed [ELSA RS, ELSA R and SRAM RED] - Easy to use (and reuse) – LED indicator and visible ANT+ ID - The replaceable CR2032 battery never leaves you without power - Manual and automatic zeroing make it truly set and forget - Built to Last – IPX7 waterproof rating, 2-year warranty, free firmware updates, and acclaimed international support - Moves with you from bike to bike - With Quarq's free Qalvin app – available for Windows, Mac, iOS and Android – you can set the zero offset, check battery voltage, run diagnostics, and perform firmware updates for free Arm Material: Carbon arms, Machined alloy spider Weight: 778 grams (GXP 172.5mm 53x39 BB not included) * Chainrings and BB sold separately
Quarq DFour Power Meter Crankset
$1,564.99
When Quarq set out to build their next-generation power meter, they wanted to build the best-performing power meter for every facet of cycling and triathlon, and for riders at every level. Like its Quarq brethren, the new DFour measures power in the heart of the bicycle — the crankset spider, scientifically proven to be the place for the most accurate measurement. With a new measurement circuit, revised strain gauge design, improved accuracy throughout the pedal stroke and software advances built into the Qalvin App, the DFour represents the state of the art in power meter technology. Every innovation in Quarq’s next-generation DZero platform is channeled into the DFour Power Meter Crankset. It embodies 10 years of Quarq technology advances with new features such as dual Bluetooth low energy and ANT+ wireless data transfer, the new Qalvin BLE app and compatibility with BB386EVO bottom brackets. - The DFour power meter is a bolt-on upgrade for Shimano’s 11-speed Dura-Ace 9000, Ultegra 6800 and 105 5800 drivetrains. - Must be paired with a compatible SRAM bottom bracket. - ELSA RS power meter owners can upgrade using the DFour Power Meter Spider. - Free firmware upgrades with the Qalvin app. - Compatible with BB30 bottom bracket. - BB30 versions ship with the spacers and wave washer required for BB386EVO installation.
SRAM Quarq CinQo Power Meter w/S975 Crankset (BB30)
$2,192.99
If you're not using a power meter and tracking your watts, then you're giving the competition an advangage. SRAM's Quarq CinQo Power Meter integrates into the crank spider for easy installation, low weight, and minimal maintenance. It's ANT+ wireless compatible, enabling you to use the head unit of your choice (sold separately), and it has no wires or external sensors, which means that your beautifully sleek road machine stays clutter-free. Since the power sensor is in the crank, you can easily switch wheels for race day. Other nice features include an easily replaced battery (no overnight charging!) and a wattage reading accuracy of +/- 2%. Also, calibration values are stored in the CinQo so there's no need to re-calibrate if you switch head units.
Sigma Sport Rox 10.0 GPS w/Speed, Cadence, HR Sensors
$361.99
Sigma's Rox 10.0 will take you to the ends of the earth! Sporting GPS, route navigation, and ANT+ technology, the Rox 10.0 gives you all the ride information you crave. Speed, distance, and time functions are just the beginning with this computer. For climbing days you get a host of functions like gradient, altitude, and a profile of the next three miles. The array of lap functions provides the perfect tools for races and intervals. The data log, docking station, and Data Center software make tracking your rides simple and easy. Plus, the speed and cadence sensors and heart rate monitor help you keep track of how hard you're working.
Garmin Vector 3S Single-Sensing Power Meter
$779.99
Single-sensing Pedal-based Power Meter Ride stronger, smarter, connected with the Vector 3S pedal-based power meter. As you strive to beat your personal best on your next race or Gran Fondo, power is the most reliable way to gauge your performance on any given day, at any given time. Unlike other power meters, Vector 3S has a sensor housed in the left pedal, so it delivers reliable, accurate data on every training session. - Installs like any other pedal and quickly transfers between bikes - Reports cadence and total power (watts) - Easily upgrades to dual-sensing system - Fully integrates with Garmin cycling ecosystem for data analysis - Allows for easy updates via compatible Edge cycling computers, ANT+ connectivity or Bluetooth-enabled fitness devices and Garmin Connect Mobile app - Battery life: up to 120 hours - Cleat hardware included WARNING: The maximum weight limit of the cyclist using the Vector system is 231 lbs (105 kg). Cyclists over this weight limit risk personal injury and property damage. Specifications: - Battery type: LR44/SR44 (x2) - Battery life: up to 120 hours - Weight: 324 g - Max. rider weight: 105 kg - Accuracy: +/- 1.0% - Cleat type: Keo - Q-factor: 53 mm/ 55mm with supplied spacing washer - Stack height: 12.2 mm - Field calibration - Adjustable release tension - Garmin Connect - Measurement location: Spindle - Communication: ANT+ and Bluetooth
Quarq DZero Power Meter Spider
$913.99
When Quarq set out to build their next-generation power meter, they wanted to build the best-performing power meter for every facet of cycling and triathlon, and for riders at every level. Like its Quarq brethren, the DZero measures power in the heart of the bicycle—the crankset spider, scientifically proven to be the place for the most accurate measurement. With a new measurement circuit, revised strain gauge design, improved accuracy throughout the pedal stroke and software advances built into the Qalvin App, the DZero Spider represents the state of the art in power meter technology Meet the Quarq DZero Power Meter Spider—the DZero in spider form. Ready to pair with any Quarq Prime Power ready cranksets. - Bluetooth low energy technology and ANT+ wireless data transfer - 10K Temperature Compensation - Battery: CR2032, 200-hour battery life, change without tools - OmniCal: swap chainrings without affecting accuracy - 2-year warranty - IPX7 waterproof rating - Accuracy within 1.5%
Quarq DZero Aluminum Power Meter Chassis BB30
$1,051.99
When Quarq set out to build their next-generation power meter, they wanted to build the best-performing power meter for every facet of cycling and triathlon, and for riders at every level. Like its Quarq brethren, the new DZero measures power in the heart of the bicycle — the crankset spider, scientifically proven to be the place for the most accurate measurement. With a new measurement circuit, revised strain gauge design, improved accuracy throughout the pedal stroke and software advances built into the Qalvin App, the DZero represents the state-of-the-art in power meter technology As Quarq’s next generation of power meters, the DZero combines 10 years of technology advances with new features such as dual Bluetooth low energy and ANT+ wireless data transfer, the new Qalvin BLE app. - 10K temperature compensation: Eliminates variables caused by heat and cold to provide an unwavering record of your performance through all conditions - Built to last: Features an IPX7 waterproof rating - Bluetooth low energy technology and ANT+ wireless data transfer - Battery: CR2032, 200-hour battery life, change without tools - OmniCal: swap chainrings without affecting accuracy - 2-year warranty - IPX7 waterproof rating - Accuracy within 1.5% - Bottom Bracket Compatibility: BB30 - Forged aluminum models do not work with BBright or BB386EVO bottom brackets
Garmin Vector 3 Dual-Sensing Power Meter
$1,299.99
Dual-sensing Pedal-based Power Meter Ride stronger, smarter, connected with the Vector 3 pedal-based power meter. As you strive to beat your personal best on your next race or Gran Fondo, power is the most reliable way to gauge your performance on any given day, at any given time. Unlike other power meters, Vector 3 has the sensors housed right in the pedals, so it delivers reliable, accurate data on every training session. - Installs like any other pedal and quickly transfers between bikes - Measures total power, left/right balance, cadence and cycling dynamics - Sleek design provides greater cornering clearance and improved stack height - Fully integrates with Garmin cycling ecosystem for data analysis - Allows for easy updates via compatible Edge cycling computers, ANT+ connectivity or Bluetooth-enabled fitness devices and Garmin Connect Mobile app - Battery life: up to 120 hours - Cleat hardware included WARNING: The maximum weight limit of the cyclist using the Vector system is 231 lbs (105 kg). Cyclists over this weight limit risk personal injury and property damage. Specifications: - Battery type: LR44/SR44 (x4) - Battery life: up to 120 hours - Weight: 316 g - Max. rider weight: 105 kg - Accuracy: +/- 1.0% - Cleat type: Keo - Q-factor: 53 mm/55 mm with supplied spacing washer - Stack height: 12.2 mm - Field calibration - Adjustable release tension - Garmin Connect - Measurement location: Spindle - Communication: ANT+ and Bluetooth
Quarq DFour91 Power Meter Chassis
$1,515.00 - $1,607.99
Make the most of your Shimano Dura-Ace R9100 groupset by upgrading to Quarq’s DFour91 power meter, which embodies all the advances of the next-generation DZero platform. Designed especially for Shimano's Dura-Ace R9100 series, the Quarq DFour91 Power Meter brings Quarq's next-generation DZero platform to Shimano's latest groupset. Compatible with Ultegra R8000 chainrings. DFour91 embodies 10 years of Quarq advances in power meter technology, plus new features such as dual Bluetooth Low Energy and ANT+ wireless data transfer, revised circuitry, a new strain gauge design and the Qalvin BLE app. The DFour91 power meter is a bolt-on upgrade, pairing with the 11-speed Dura-Ace R9100 or Ultegra R8000 chainrings. Get the chassis, which includes Quarq's lightweight, sturdy Exogram carbon crank arms. The GXP and BB30 versions work with every bottom bracket shell, including BBright and BB386EVO. If you already have a power meter using the 8-bolt interface, upgrade with the DFour91 spider. Features & Benefits: - Exogram carbon crank arms - Bluetooth low energy technology and ANT+ wireless data transfer - AxCad – no cadence magnet required - 10K Temperature Compensation - Battery – CR2032, 200-hour battery life, change without tools - Power Balance - OmniCal – swap chainrings without affecting accuracy - 2-year warranty - IPX7 waterproof rating - Accuracy – within 1.5%, measuring both legs - Free firmware upgrades with the Qalvin app Essential Details: - Designed for Dura-Ace R9100 chainrings. Compatible with Ultegra R8000 chainrings. - Must be paired with a compatible SRAM bottom bracket. - BB30 versions ship with the spacers and wave washer required for BB386EVO installation. - 8-bolt power meter owners can upgrade using the DFour91 Power Meter Spider.
Specialized Power Cranks - Shimano 105 Upgrade Kit
Whether you're looking to take your training to the next level or you simply want a better way to measure energy expenditure, a power meter is your best bet. And the Power Cranks 105 Upgrade Kit are no exception. With our lightweight power sensors on a Shimano 105 crankarm, it's the perfect way to enter the power meter game. The development of Power Cranks began with our Human Performance Team looking at riders in realistic scenarios on the bike. Historically, power meters have been validated by two different methods—one is by measuring the produced torque by applying a static, linear load to a crankarm or chainring, while the second uses a power generating motor to pedal the bike. Well, cycling is neither static nor linear, and humans apply power much differently than a machine. So, we found that neither of these methods answers the 'real-world' accuracy question. To get the best test for accuracy, in all types of riding scenarios, we built our own cycling treadmill, the WinMill, to measure power output to a known truth. This new benchmark lets us evaluate accuracy under all riding conditions—seated versus standing, various power and cadence levels, different weights, and a myriad of gear. This data acquisition process is our gold-standard for testing power meters, and through our testing and external validation from the Locomotion Lab in Boulder, Colorado, Power Cranks have been proven to have the highest accuracy in real-world scenarios (+/- 1.5%). The Power Cranks are also easy to live with, with class-leading temperature compensation firmware and waterproof enclosures. Calibration is only required during seasonal-type fluctuations in temperature, and the included wrench makes battery swaps a breeze. - +/- 1.5% real-world accuracy tested on the WinMill and validated by the Locomotion Lab in Boulder, CO. - Works with ANT+ and Bluetooth devices. - Easy set-up and diagnostics with the Specialized Power app. (iOS and Android versions available). - Shimano 5800 generation 105 left-side power measurement. - Right crankarm and spider NOT included. - Available in 170-175mm crankarm lengths.
Specialized Power Cranks - Shimano Ultegra Upgrade Kit
Whether you're looking to take your training to the next level or you simply want a better way to measure energy expenditure, a power meter is your best bet. And the Power Cranks Ultegra Upgrade Kit are no exception. With our lightweight power sensors on a Shimano Ultegra crankarm, it's the perfect way to enter the power meter game. The development of Power Cranks began with our Human Performance Team looking at riders in realistic scenarios on the bike. Historically, power meters have been validated by two different methods—one is by measuring the produced torque by applying a static, linear load to a crankarm or chainring, while the second uses a power generating motor to pedal the bike. Well, cycling is neither static nor linear, and humans apply power much differently than a machine. So, we found that neither of these methods answers the 'real-world' accuracy question. To get the best test for accuracy, in all types of riding scenarios, we built our own cycling treadmill, the WinMill, to measure power output to a known truth. This new benchmark lets us evaluate accuracy under all riding conditions—seated versus standing, various power and cadence levels, different weights, and a myriad of gear. This data acquisition process is our gold-standard for testing power meters, and through our testing and external validation from the Locomotion Lab in Boulder, Colorado, Power Cranks have been proven to have the highest accuracy in real-world scenarios (+/- 1.5%). The Power Cranks are also easy to live with, with class-leading temperature compensation firmware and waterproof enclosures. Calibration is only required during seasonal-type fluctuations in temperature, and the included wrench makes battery swaps a breeze. - +/- 1.5% real-world accuracy tested on the WinMill and validated by the Locomotion Lab in Boulder, CO. - Works with ANT+ and Bluetooth® devices. - Easy set-up and diagnostics with the Specialized Power app. (iOS and Android versions available). - Shimano 8000 generation Ultegra left-side power measurement. - Right crankarm and spider NOT included. - Available in 170-175mm crankarm lengths.
Specialized Power Cranks Dura-Ace Dual
No matter your skill level or experience on the bike, there's no better way to enhance your training and racing performance than by riding with a power meter. And for all of you Dura-Ace fans out there, we've combined our extremely light power sensors with a Shimano Dura-Ace crankset to give you the most accurate and precise power meter available. The development of Power Cranks began with our Human Performance Team looking at riders in realistic scenarios on the bike. Historically, power meters have been validated by two different methods—one is by measuring the produced torque by applying a static, linear load to a crankarm or chainring, while the second uses a power generating motor to pedal the bike. Well, cycling is neither static nor linear, and humans apply power much differently than a machine. So, we found that neither of these methods answers the "real-world" accuracy question. To get the best test for accuracy, in all types of riding scenarios, we built our own cycling treadmill, the WinMill, to measure power output to a known truth. This new benchmark lets us evaluate accuracy under all riding conditions—seated versus standing, various power and cadence levels, different weights, and a myriad of gear. This data acquisition process is our gold-standard for testing power meters, and through our testing and external validation from the Locomotion Lab in Boulder, Colorado, Power Cranks have been proven to have the highest accuracy in real-world scenarios (+/- 1.5%). The Dual-Sided S-Works Power Cranks utilize separate strain gauge systems to individually measure the effort produced by each leg. This maximizes the accuracy of your total power numbers, plus it helps you to better understand your performance as fatigue increases and when you're recovering from injury. And with class-leading temperature compensation firmware and waterproof enclosures, Power Cranks are easy to live with. Calibration is only required during seasonal-type fluctuations in temperature, and the included wrench makes battery swaps a breeze. - +/- 1.5% real-world accuracy tested on the WinMill and validated by the Locomotion Lab in Boulder, CO - Independent, dual-leg power measurement - Works with ANT+ and Bluetooth devices - Easy set-up and diagnostics with the Specialized Power app. (iOS and Android versions available) - Available in 170-175mm crankarm lengths - All models include 52/36T chainrings
Specialized S-Works Power Cranks - Dual-Sided
No matter your skill level or experience on the bike, there's no better way to enhance your training and racing performance than by riding with a power meter. Lucky for you, Specialized has combined their incredibly light and stiff carbon fiber S-Works road cranks with dual-sided power measurement, making it the lightest (440g/172.5mm) and most accurate power meter available. The development of Power Cranks began with Specialized's Human Performance Team looking at riders in realistic scenarios on the bike. Historically, power meters have been validated by two different methods—one is by measuring the produced torque by applying a static, linear load to a crankarm or chainring, while the second uses a power generating motor to pedal the bike. Well, cycling is neither static nor linear, and humans apply power much differently than a machine. So, they found that neither of these methods answer the "real-world" accuracy question. To get the best test for accuracy, in all types of riding scenarios, Specialized built their own cycling treadmill, the WinMill, to measure power output to a known truth. This new benchmark lets them evaluate accuracy under all riding conditions—seated versus standing, various power and cadence levels, different weights, and a myriad of gear. This data acquisition process is their gold-standard for testing power meters, and through their testing and external validation from the Locomotion lab in Boulder, Colorado, Power Cranks have been proven to have the highest accuracy in real world scenarios (+/- 1.5%). The Dual-Sided S-Works Power Cranks utilize separate strain gauge systems to individually measure the effort produced by each leg. This maximizes the accuracy of your total power numbers, plus it helps you to better understand your performance as fatigue increases and when you're recovering from injury. And with class-leading temperature compensation firmware and waterproof enclosures, Power Cranks are easy to live with. Calibration is only required during seasonal-type fluctuations in temperature, and the included wrench makes battery swaps a breeze. - +/-1.5% real-world accuracy tested on the WinMill and validated by the Locomotion Lab in Boulder, CO. - Independent, dual-leg power measurement. - Works with ANT+ and Bluetooth devices. - Easy set-up and diagnostics with the Specialized Power app. (iOS and Android versions available). - Hollow carbon crankarms, carbon spider, and oversized alloy spindle offer superior stiffness and lighter weight than the competition—440 grams for 172.5mm crankarm length. - Fits Specialized road frames with OSBB or PF30 bottom bracket shell, as well as most BB30 road frames. - 110 BCD carbon spider (also compatible with 130 BCD carbon spider—sold separately). - Compatible with Shimano and SRAM drivetrains. Chainrings are sold separately. Use only with Specialized/Praxis chainrings 06217-1702 (52/36T) and 06218-1713 (50/34T). - Available in 165-180mm crankarm lengths.
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