Garmin Rally RK100 Road Power Meter PedalsBringing you some of Garmin’s top cycling technologies but at a slightly more affordable price point, the Rally RK100 Pedal Power Meter pedals build on the success of the Vector 3S model. This version gives you single-sided power and cadence data, which you can then double up to get an accurate calculation of your overall output. These pedals are the ideal upgrade for those who want to take their training seriously, in order to see serious results on race day.Single-Sided Pedalling AnalysisGarmin's Rally power meters are tested to the extreme, so you can ride there too. Designed for road cyclists, the Rally RK100 features LOOK KEO cleat compatibility and measures single sided power and cadence. You can even monitor how you apply power throughout the pedal stroke. These durable power meter pedals install like any other pedals and are easy to transfer between bikes.ANT+ and Bluetooth ConnectivityThe ANT+ and Bluetooth technology in these smart pedals enables you to instantly see accurate power measurements on your compatible Garmin device (sold separately) or smartphone and review later on the Garmin Connect app. View your data on popular applications such as Strava, TrainingPeaks and TrainerRoad for further analysis, sharing and more. Features: Rally RK100 single-sensing power meter measures total power and cadence Rally RK100 is an affordable power meter with the option to upgrade to a dual-sensing system Installs like any other pedal and quickly transfers between bikes Superior pedal design installs like any other pedal and quickly transfers between bikes; compatible with LOOK KEO cleats Sleek design provides greater cornering clearance and improved stack height Fully integrates with Garmin cycling ecosystem for data analysis Allows for easy software updates via your Garmin watch, Edge cycling computers or the Garmin ConnectTM app on your compatible smartphone For post-ride analysis, data sharing, mapping, route planning and more, sync your data with the Garmin Connect app as well as platforms such as Strava, TrainingPeaks and TrainerRoad When the seasons change, you can transfer the spindle between Rally RS/Rally XC pedal body kits (sold separately), which are also compatible with the Vector 3 power meter Field calibration Adjustable cleat release tension Axle Size: Standard 9/16" thread Cleat Type: KEO (cleats included) Battery Type: LR44/SR44 (x4) Battery Life: up to 120 hours (with LR44 battery type) Accuracy: +/- 1.0% Communication: ANT+ and Bluetooth Box Includes: 2x Rally RK100 power pedals, cleats with 6 degrees of float, documentationBuy Garmin Components from Chain Reaction Cycles, the World's Largest Online Bike Store.
Garmin Rally RS100 Road Power Meter PedalsBringing you some of Garmin’s top cycling technologies but at a slightly more affordable price point, the Rally RS100 Pedal Power Meter pedals build on the success of the Vector 3S model. This Shimano Pedalling Dynamics - Superlight (SPD-SL) compatible pair work with most road shoes on the market and give you single-sided power and cadence data, which you can then double up to get an accurate calculation of your overall output. These pedals are the ideal upgrade for those who want to take their training seriously, in order to see serious results on race day.Single-Sided Pedalling AnalysisGarmin's Rally power meters are tested to the extreme, so you can ride there too. Designed for road cyclists, you can even monitor how you apply power throughout the pedal stroke. These durable power meter pedals install like any other pedals and are easy to transfer between bikes.ANT+ and Bluetooth ConnectivityThe ANT+ and Bluetooth technology in these smart pedals enables you to instantly see accurate power measurements on your compatible Garmin device (sold separately) or smartphone and review later on the Garmin Connect app. View your data on popular applications such as Strava, TrainingPeaks and TrainerRoad for further analysis, sharing and more. Features: Rally RS100 single-sensing power meter measures total power and cadence Rally RS100 is an affordable power meter with the option to upgrade to a dual-sensing system Installs like any other pedal and quickly transfers between bikes Superior pedal design installs like any other pedal and quickly transfers between bikes; compatible with Shimano SPD-SL cleats Sleek design provides greater cornering clearance and improved stack height Fully integrates with Garmin cycling ecosystem for data analysis Allows for easy software updates via your Garmin watch, Edge cycling computers or the Garmin ConnectTM app on your compatible smartphone For post-ride analysis, data sharing, mapping, route planning and more, sync your data with the Garmin Connect app as well as platforms such as Strava, TrainingPeaks and TrainerRoad When the seasons change, you can transfer the spindle between Rally RS/Rally XC pedal body kits (sold separately), which are also compatible with the Vector 3 power meter Field calibration Adjustable cleat release tension Axle Size: Standard 9/16" thread Cleat Type: Shimano SPD-SL (cleats included) Battery Type: LR44/SR44 (x4) Battery Life: up to 120 hours (with LR44 battery type) Accuracy: +/- 1.0% Communication: ANT+ and Bluetooth Box Includes: 2x Rally RS100 power pedals, cleats with 6 degrees of float, documentationBuy Garmin Components from Chain Reaction Cycles, the World's Largest Online Bike Store.
Garmin Rally RS200 Road Power Meter PedalsOffering you accurate, reliable and instant ride data to help you adapt and improve your pedalling performance, the Rally RK200 Pedal Power Meter builds on the technologies of Garmin’s popular Vector 3 series. As easy to install as normal clipless pedals, they adopt the commonly used Shimano Shimano Pedalling Dynamics - Superlight (SPD-SL) cleat system for compatibility with most road bike shoes.Left and Right Pedalling AnalysisGarmin's Rally power meters are tested to the extreme, so you can ride there too. Designed for road cyclists, the dual-sensing Rally RS200 measures total power, cadence and left/right balance. You can even monitor how you apply power throughout the pedal stroke. These durable power meter pedals install like any other pedals and are easy to transfer between bikes.ANT+ and Bluetooth ConnectivityThe ANT+ and Bluetooth technology in these smart pedals enables you to instantly see accurate power measurements on your compatible Garmin device (sold separately) or smartphone and review later on the Garmin Connect app. View your data on popular applications such as Strava, TrainingPeaks and TrainerRoad for further analysis, sharing and more. Features: Rally RS200 dual-sensing power meter measures total power, cadence, left/right balance, seated versus standing, platform centre offset and power phase Installs like any other pedal and quickly transfers between bikes Superior pedal design installs like any other pedal and quickly transfers between bikes; compatible with Shimano SPD-SL cleats Sleek design provides greater cornering clearance and improved stack height Fully integrates with Garmin cycling ecosystem for data analysis Allows for easy software updates via your Garmin watch, Edge cycling computers or the Garmin ConnectTM app on your compatible smartphone For post-ride analysis, data sharing, mapping, route planning and more, sync your data with the Garmin Connect app as well as platforms such as Strava, TrainingPeaks and TrainerRoad When the seasons change, you can transfer the spindle between Rally RS/Rally XC pedal body kits (sold separately), which are also compatible with the Vector 3 power meter Field calibration Adjustable cleat release tension Axle Size: Standard 9/16" thread Cleat Type: Shimano SPD-SL (cleats included) Battery Type: LR44/SR44 (x4) Battery Life: up to 120 hours (with LR44 battery type) Accuracy: +/- 1.0% Communication: ANT+ and Bluetooth Box Includes: 2x Rally RS200 power pedals, cleats with 6 degrees of float, documentationBuy Garmin Components from Chain Reaction Cycles, the World's Largest Online Bike Store.
Garmin Rally RK200 Road Power Meter PedalsOffering you accurate, reliable and instant ride data to help you adapt and improve your pedalling performance, the Rally RK200 Pedal Power Meter builds on the technologies of Garmin’s popular Vector 3 series. As easy to install as normal clipless pedals, they adopt the commonly used LOOK KEO cleat system for compatibility with most road bike shoes.Left and Right Pedalling AnalysisGarmin's Rally power meters are tested to the extreme, so you can ride there too. Designed for road cyclists, the dual-sensing Rally RK200 measures total power, cadence and left/right balance. You can even monitor how you apply power throughout the pedal stroke. These durable power meter pedals install like any other pedals and are easy to transfer between bikes.ANT+ and Bluetooth ConnectivityThe ANT+ and Bluetooth technology in these smart pedals enables you to instantly see accurate power measurements on your compatible Garmin device (sold separately) or smartphone and review later on the Garmin Connect app. View your data on popular applications such as Strava, TrainingPeaks and TrainerRoad for further analysis, sharing and more. Features: Rally RK200 dual-sensing power meter measures total power, cadence, left/right balance, seated versus standing, platform centre offset and power phase Installs like any other pedal and quickly transfers between bikes Superior pedal design installs like any other pedal and quickly transfers between bikes; compatible with LOOK KEO cleats Sleek design provides greater cornering clearance and improved stack height Fully integrates with Garmin cycling ecosystem for data analysis Allows for easy software updates via your Garmin watch, Edge cycling computers or the Garmin ConnectTM app on your compatible smartphone For post-ride analysis, data sharing, mapping, route planning and more, sync your data with the Garmin Connect app as well as platforms such as Strava, TrainingPeaks and TrainerRoad When the seasons change, you can transfer the spindle between Rally RS/Rally XC pedal body kits (sold separately), which are also compatible with the Vector 3 power meter Field calibration Adjustable cleat release tension Axle Size: Standard 9/16" thread Cleat Type: KEO (cleats included) Battery Type: LR44/SR44 (x4) Battery Life: up to 120 hours (with LR44 battery type) Accuracy: +/- 1.0% Communication: ANT+ and Bluetooth Box Includes: 2x Rally RK200 power pedals, cleats with 6 degrees of float, documentationBuy Garmin Components from Chain Reaction Cycles, the World's Largest Online Bike Store.
Garmin Rally XC100 MTB Power Meter PedalsBringing you some of Garmin’s top cycling technologies but at a slightly more affordable price point, the Rally XC100 Pedal Power Meter pedals build on the success of the Vector 3S model. This Shimano Pedalling Dynamics (SPD) compatible pair work with most mountain bike (MTB) shoes on the market and give you single-sided power and cadence data, which you can then double up to get an accurate calculation of your overall output. These pedals are the ideal upgrade for those who want to take their training seriously, in order to see serious results on race day.Single-Sided Pedalling AnalysisGarmin's Rally power meters are tested to the extreme, so you can ride there too. Designed for off-road cyclists, you can even monitor how you apply power throughout the pedal stroke. These durable power meter pedals install like any other pedals and are easy to transfer between bikes. Now you can have power readings whether you ride gravel, cross-country (XC) mountain bike (MTB) or even cyclocross (CX).ANT+ and Bluetooth ConnectivityThe ANT+ and Bluetooth technology in these smart pedals enables you to instantly see accurate power measurements on your compatible Garmin device (sold separately) or smartphone and review later on the Garmin Connect app. View your data on popular applications such as Strava, TrainingPeaks and TrainerRoad for further analysis, sharing and more. Features: Rally XC100 single-sensing power meter measures total power and cadence Rally XC100 is an affordable power meter with the option to upgrade to a dual-sensing system Installs like any other pedal and quickly transfers between bikes Superior pedal design installs like any other pedal and quickly transfers between bikes; compatible with Shimano SPD cleats Sleek design provides greater cornering clearance and improved stack height Fully integrates with Garmin cycling ecosystem for data analysis Allows for easy software updates via your Garmin watch, Edge cycling computers or the Garmin ConnectTM app on your compatible smartphone For post-ride analysis, data sharing, mapping, route planning and more, sync your data with the Garmin Connect app as well as platforms such as Strava, TrainingPeaks and TrainerRoad When the seasons change, you can transfer the spindle between Rally RS/Rally XC pedal body kits (sold separately), which are also compatible with the Vector 3 power meter Field calibration Adjustable cleat release tension Axle Size: Standard 9/16" thread Cleat Type: Shimano SPD (cleats included) Battery Type: LR44/SR44 (x4) Battery Life: up to 120 hours (with LR44 battery type) Accuracy: +/- 1.0% Communication: ANT+ and Bluetooth Box Includes: 2x Rally XC100 power pedals, cleats with 6 degrees of float, documentationBuy Garmin Components from Chain Reaction Cycles, the World's Largest Online Bike Store.
Garmin Rally XC200 MTB Power Meter PedalsOffering you accurate, reliable and instant ride data to help you adapt and improve your pedalling performance, the Rally RK200 Pedal Power Meter builds on the technologies of Garmin’s popular Vector 3 series. As easy to install as normal clipless pedals, they adopt the commonly used Shimano Pedalling Dynamics (SPD) cleat system for compatibility with most mountain bike (MTB) shoes.Left and Right Pedalling AnalysisGarmin's Rally power meters are tested to the extreme, so you can ride there too. Designed for road cyclists, the dual-sensing Rally XC200 measures total power, cadence and left/right balance. You can even monitor how you apply power throughout the pedal stroke. These durable power meter pedals install like any other pedals and are easy to transfer between bikes. Now you can have power readings whether you ride gravel, cross-country (XC) mountain bike (MTB) or even cyclocross (CX). ANT+ and Bluetooth ConnectivityThe ANT+ and Bluetooth technology in these smart pedals enables you to instantly see accurate power measurements on your compatible Garmin device (sold separately) or smartphone and review later on the Garmin Connect app. View your data on popular applications such as Strava, TrainingPeaks and TrainerRoad for further analysis, sharing and more. Features: Rally XC200 dual-sensing power meter measures total power, cadence, left/right balance, seated versus standing, platform centre offset and power phase Installs like any other pedal and quickly transfers between bikes Superior pedal design installs like any other pedal and quickly transfers between bikes; compatible with Shimano SPD cleats Sleek design provides greater cornering clearance and improved stack height Fully integrates with Garmin cycling ecosystem for data analysis Allows for easy software updates via your Garmin watch, Edge cycling computers or the Garmin ConnectTM app on your compatible smartphone For post-ride analysis, data sharing, mapping, route planning and more, sync your data with the Garmin Connect app as well as platforms such as Strava, TrainingPeaks and TrainerRoad When the seasons change, you can transfer the spindle between Rally RS/Rally XC pedal body kits (sold separately), which are also compatible with the Vector 3 power meter Field calibration Adjustable cleat release tension Axle Size: Standard 9/16" thread Cleat Type: Shimano SPD (cleats included) Battery Type: LR44/SR44 (x4) Battery Life: up to 120 hours (with LR44 battery type) Accuracy: +/- 1.0% Communication: ANT+ and Bluetooth Box Includes: 2x Rally XC200 power pedals, cleats with 6 degrees of float, documentationBuy Garmin Components from Chain Reaction Cycles, the World's Largest Online Bike Store.
Garmin Rally Road Power Meter Upgrade PedalDeveloped for riders who already own a compatible Garmin pedal-based power meter, this conversion kit allows you to swap the power sensor to new pedal bodies for use on another bike. Whether you're clocking up the miles on your road bike or exploring off-road routes on your gravel bike, this conversion kit makes it easy to bring power to every ride. This kit contains all the components you need to make the switch.Please note: This product contains pedal bodies only, spindles and electronics are not included.Compatibility:There are two options available in this product:The Garmin Rally RS option is designed for use with Rally RK100, Rally RK200, Rally XC100, Rally XC200 and Vector 3.The Garmin Rally RK option is designed for use with Rally RS100, Rally RS200, Rally XC100, Rally XC200 and Vector 3.Cleat Compatibility:The Garmin Rally RS option is compatible with Shimano SPD-SL style cleats.The Garmin Rally RK option is compatible with Look Keo.Features: Left and right pedal bodies Replacement seals 55mm Q-factor washers Battery doorsManufacturer's Part Numbers: 010-12900-00 Black Look 010-12900-01 Black ShimanoBuy Garmin Components from Chain Reaction Cycles, the World's Largest Online Bike Store.
Garmin Rally Road Power Meter Upgrade PedalDeveloped for riders who already own a compatible Garmin pedal-based power meter, this conversion kit allows you to swap the power sensor to new pedal bodies for use on another bike. Whether you're clocking up the miles on your road bike or exploring off-road routes on your gravel bike, this conversion kit makes it easy to bring power to every ride. This kit contains all the components you need to make the switch.Please note: This product contains pedal bodies only, spindles and electronics are not included.Compatibility:There are two options available in this product:The Garmin Rally RS option is designed for use with Rally RK100, Rally RK200, Rally XC100, Rally XC200 and Vector 3.The Garmin Rally RK option is designed for use with Rally RS100, Rally RS200, Rally XC100, Rally XC200 and Vector 3.Cleat Compatibility:The Garmin Rally RS option is compatible with Shimano SPD-SL style cleats.The Garmin Rally RK option is compatible with Look Keo.Features: Left and right pedal bodies Replacement seals 55mm Q-factor washers Battery doorsManufacturer's Part Numbers: 010-12900-00 Black Look 010-12900-01 Black ShimanoBuy Garmin Components from Chain Reaction Cycles, the World's Largest Online Bike Store.
Garmin Rally XC MTB Power Meter Upgrade PedalSpecifically designed for riders who already own Garmin Rally XC100 power meter pedals, this upgrade pedal converts your single-sided power meter set-up into an in-depth dual-sensing power meter. Perfect for transforming your training sessions, you can analyse more than just watts to see exactly how your pedalling style generates the force that moves you.When paired with Rally XC100, the upgrade pedal completes the Rally power meter system, providing left/right balance data and cycling dynamics. The power sensor is even transferable to Rally RS and RK pedals so you can have power wherever you ride.Revolutionary cycling dynamics display where you're generating power throughout the pedal stroke and show left/right balance. See where you apply force on the pedal to ensure proper cleat position and track seated vs. standing to see how position changes efficiency.Left and Right Pedalling AnalysisGarmin's Rally power meters are tested to the extreme, so you can ride there too. Designed for road cyclists, the dual-sensing technology measures total power, cadence and left/right balance. You can even monitor how you apply power throughout the pedal stroke. The upgrade pedal installs like any other pedal and it's easy to transfer between bikes. Now you can have power readings whether you ride gravel, cross country (XC) mountain bike (MTB) or even cyclocross (CX).ANT+ and Bluetooth ConnectivityThe ANT+ and Bluetooth technology in these smart pedals enables you to instantly see accurate power measurements on your compatible Garmin device (sold separately) or smartphone and review later on the Garmin Connect app. View your data on popular applications such as Strava, TrainingPeaks and TrainerRoad for further analysis, sharing and more.Features: Dual-Sensing Power Meter Upgrade Pedal Use: Cross Country (XC) Compatibility: Garmin Rally XC100 Axle Size: Standard 9/16" thread Cleat Type: SPD (cleats included) Battery Life: Up to 120 hours (with LR44 battery type) Accuracy: +/- 1.0% Communication: ANT+ and Bluetooth Box Includes: 1x upgrade pedal Adjustable cleat release tension Sleek design provides greater cornering clearance and improved stack height Fully integrates with Garmin cycling ecosystem for data analysis Allows for easy software updates via your Garmin watch, Edge cycling computers or the Garmin ConnectTM app on your compatible smartphone For post-ride analysis, data sharing, mapping, route planning and more, sync your data with the Garmin Connect app as well as platforms such as Strava, TrainingPeaks and TrainerRoad When the seasons change, you can transfer the spindle between Rally RS/Rally XC pedal body kits (sold separately), which are also compatible with the Vector 3 power meter Manufacturer's Part Number: 010-12987-02 Black XC SPDBuy Garmin Components from Chain Reaction Cycles, the World's Largest Online Bike Store.
Race Face Race Face Cinch Power Meter SpindleThe perfect training companion for avid enduro and cross country riders, this discrete power meter sits inside your bottom bracket, measuring your pedal and cadence data as you seek the best possible form. Kept safe by your BB shell, the Cinch uses Bluetooth and ANT+ to relay data to the Cinch Power Meter App for iPhone or Android, letting you analyse and adapt your run in real time. Compatible with a variety of cranksets, this is a superb performance-enhancing gadget. Features: Power Accuracy: +-/2% Measurements: Cadence, pedal efficiency Connectivity: Dual Bluetooth low energy technology and ANT+ Battery Life: Over 400h, USB rechargeable Compatibility: 1x or 2x configurations App: Cinch Power Meter App for iPhone or Android Fits: Next SL G4, Next G3, Next R, Turbine Size: BSA 68/73mm, BB92/89, PF30 68/73mm Weight: 65g Buy Race Face Components from Chain Reaction Cycles, the World's Largest Online Bike Store.
Shimano Ultegra R8100 12 Speed Power MeterThe Ultegra R8100 12 Speed Power Meter from Shimano is the ideal chainset to track your cycling performance output. It features Hollowtech II crankarms, a Hollowglide outer chainring and an ultra-precise integrated power meter. This top-quality power meter provides 1.5% strain gauge accuracy and up to 300+ hours of battery life, so you can accurately record your power output as you ride. And it's compatible with ANT+ and Bluetooth LE to communicate with your favourite cycling apps and computer software.Offering all the precision and functionality of the 12-Speed Shimano Dura-Ace power meter, the Ultegra FC-R8100-P power meter comes in a more affordable package. Scientific training requires accurate measurement and user-friendliness, and the new Ultegra R8100 power meter has both. Its dual-sided measurement is accurate within 1.5% and zero offset calibration is a quick and easy process. Perhaps most importantly, its long battery life, easy recharge, and ANT+ and BluetoothLE connectivity make using and recording your workouts easier than ever. Bluetooth LE and ANT+ ConnectivityThe Ultegra R8100 Power Meter brings everything a data-driven cyclist could want. Its integrated, waterproof design brings all-weather reliability while delivering accurate information including left/right balance. A rechargeable Li-ion battery is user-friendly and Bluetooth LE and ANT+ connectivity ensure easy setup. Hollowglide Chainring TechnologyHollow technology on the outer chainring. The Hollowglide construction ensures high rigidity while its hollow structure cuts down on weight yet maintains strength. This provides better power transfer and quicker and more precise front shifting performance. Hollowtech II Forged Crank ArmsA lightweight crankset not only reduces the bike's weight but decreases rotating mass to aid in acceleration. The challenge is to reduce the weight of the crank without reducing its strength and rigidity. Shimano's advanced forging technology has solved the problem through the HOLLOWTECH crank. Just like high-quality frame tubing, a hollow crank arm can provide amazing strength and rigidity at very lightweight. The Best Balance of Stiffness, Strength and WeightThe concept of Hollowtech II technology is focused on producing a superior crankset that will maximize a rider's power transfer. The rigidity of the crankset ensures pedalling efficiency while its low weight, a key element of the crankset, aids in cycling longer distances over which the rider needs to pedal more. Naturally, Shimano strove for the optimum balance between the conflicting needs of stiffness while producing a lightweight crank. The addition of Hollowtech II technology integrates the bottom bracket axle with the right crankarm for more stiffness and weight savings to achieve a high-dimensional balance. Its outboard bottom bracket bearing system provides better weight distribution and more pedalling stability, allowing for more efficient power transfer. Features: Series: Ultegra R8100 Series Integrated, waterproof, and rechargeable Li-ion battery Up to 300+ hours of ride time * Depending on ANT+/BluetoothLE settings Accurate data collection 1.5% strain gage accuracy throughout the entire calibration range * Depending on ANT+/BluetoothLE settings Proprietary strain gauge Possible to start quickly Simple zero offset calibration with switch on the transmitter Active temperature compensation - the software automatically compensates for temperature changes Weight: 769g (52-36T); 758g (50-34T)A 2-year warranty is offered with all Shimano products from Chain Reaction Cycles (3 years on Dura-Ace and XTR products).Buy Shimano Components from Chain Reaction Cycles, the World's Largest Online Bike Store.
Shimano Ultegra R8100 12 Speed Power MeterThe Ultegra R8100 12 Speed Power Meter from Shimano is the ideal chainset to track your cycling performance output. It features Hollowtech II crankarms, a Hollowglide outer chainring and an ultra-precise integrated power meter. This top-quality power meter provides 1.5% strain gauge accuracy and up to 300+ hours of battery life, so you can accurately record your power output as you ride. And it's compatible with ANT+ and Bluetooth LE to communicate with your favourite cycling apps and computer software.Offering all the precision and functionality of the 12-Speed Shimano Dura-Ace power meter, the Ultegra FC-R8100-P power meter comes in a more affordable package. Scientific training requires accurate measurement and user-friendliness, and the new Ultegra R8100 power meter has both. Its dual-sided measurement is accurate within 1.5% and zero offset calibration is a quick and easy process. Perhaps most importantly, its long battery life, easy recharge, and ANT+ and BluetoothLE connectivity make using and recording your workouts easier than ever. Bluetooth LE and ANT+ ConnectivityThe Ultegra R8100 Power Meter brings everything a data-driven cyclist could want. Its integrated, waterproof design brings all-weather reliability while delivering accurate information including left/right balance. A rechargeable Li-ion battery is user-friendly and Bluetooth LE and ANT+ connectivity ensure easy setup. Hollowglide Chainring TechnologyHollow technology on the outer chainring. The Hollowglide construction ensures high rigidity while its hollow structure cuts down on weight yet maintains strength. This provides better power transfer and quicker and more precise front shifting performance. Hollowtech II Forged Crank ArmsA lightweight crankset not only reduces the bike's weight but decreases rotating mass to aid in acceleration. The challenge is to reduce the weight of the crank without reducing its strength and rigidity. Shimano's advanced forging technology has solved the problem through the HOLLOWTECH crank. Just like high-quality frame tubing, a hollow crank arm can provide amazing strength and rigidity at very lightweight. The Best Balance of Stiffness, Strength and WeightThe concept of Hollowtech II technology is focused on producing a superior crankset that will maximize a rider's power transfer. The rigidity of the crankset ensures pedalling efficiency while its low weight, a key element of the crankset, aids in cycling longer distances over which the rider needs to pedal more. Naturally, Shimano strove for the optimum balance between the conflicting needs of stiffness while producing a lightweight crank. The addition of Hollowtech II technology integrates the bottom bracket axle with the right crankarm for more stiffness and weight savings to achieve a high-dimensional balance. Its outboard bottom bracket bearing system provides better weight distribution and more pedalling stability, allowing for more efficient power transfer. Features: Series: Ultegra R8100 Series Integrated, waterproof, and rechargeable Li-ion battery Up to 300+ hours of ride time * Depending on ANT+/BluetoothLE settings Accurate data collection 1.5% strain gage accuracy throughout the entire calibration range * Depending on ANT+/BluetoothLE settings Proprietary strain gauge Possible to start quickly Simple zero offset calibration with switch on the transmitter Active temperature compensation - the software automatically compensates for temperature changes Weight: 769g (52-36T); 758g (50-34T)A 2-year warranty is offered with all Shimano products from Chain Reaction Cycles (3 years on Dura-Ace and XTR products).Buy Shimano Components from Chain Reaction Cycles, the World's Largest Online Bike Store.