Fizik R2 Vento Powerstrap Aeroweave Road ShoesA new breed of super-light and super-ventilated racing shoes, the Fizik R2 Vento Powerstrap Aeroweave Road Shoes deliver race-winning, rival-dropping pedalling performance alongside outstanding levels of cool airflow. Fizik's engineers set themselves the task of creating a super-light shoe that made no sacrifices to foot support and pedalling performance. It also had to be incredibly breathable too. The result is the R2 Vento Powerstrap Aeroweave Road Shoes. Aeroweave TechnologyAeroweave is an innovative woven fabric, interweaving lightweight nylon fibres with filaments of thermoplastic polymer. This combination creates a net-like structure that is highly durable but offers incredible levels of ventilation. Not only that, Aeroweave offers a supple fit, moving and cradling the foot for comfort while retaining the full support you need for a stable and efficient pedal stroke. Powerstrap PerformanceThe R2 Vento Powerstrap Aeroweave secure your foot with a simple but ingenious configuration of the traditional strap system.In order to offer stability and comfort throughout your ride, the Powerstrap system features a lightweight and reliable hook and loop strap system that pulls together the two sides of the upper. However, unlike a traditional system, the Powerstraps fully wrap around the upper. This provides even pressure across the whole foot, the ribbon wrapping around your foot for an unrivalled level of riding comfort. Another benefit is a much more aero finish than a traditional strap system. R2 Carbon OutsoleThe stiffest and lightest sole unit in the Fizik range, R2 Carbon Outsole delivers incredible responsiveness, with power transferred to your pedals with outstanding efficiency. Jump for a sprint or attack a climb and you're rewarded with immediate acceleration - only fitness is holding you back.Efficient pedalling is also optimised thanks to the cleat track position. This has been set further rearwards to improve pedalling dynamics, reduce knee compression and power transfer - it's especially well-suited to very aggressive, forward aero riding positions.Cleat GuidanceThese Cycling Shoes are compatible with road bike pedal systems that use cleats with 3-bolt standards, such as: Look Delta and Keo, Shimano SPD-SL, Speedplay Light Action, Zero, X-Series (via 3-hole adapter plate), Campagnolo Pro-Fit, Mavic Zxellium, Time Iclic/Xpresso and Time Impact.Features:Aeroweave - extremely breathable, high tenacity net-like upper structurePowerstrap - foot-wrapping Velcro closure designed for an enveloping fitR2 carbon outsole - optimized cleat positioning, high stiffness andlightness tuned for power transferR2 outsole - full carbon, stiffness index 103-bolt cleat compatible (cleats not supplied)Weight: 196g (size 42)Buy Fizik Footwear from Chain Reaction Cycles, the World's Largest Online Bike Store.
Fizik R2 Vento Powerstrap Aeroweave Road ShoesA new breed of super-light and super-ventilated racing shoes, the Fizik R2 Vento Powerstrap Aeroweave Road Shoes deliver race-winning, rival-dropping pedalling performance alongside outstanding levels of cool airflow. Fizik's engineers set themselves the task of creating a super-light shoe that made no sacrifices to foot support and pedalling performance. It also had to be incredibly breathable too. The result is the R2 Vento Powerstrap Aeroweave Road Shoes. Aeroweave TechnologyAeroweave is an innovative woven fabric, interweaving lightweight nylon fibres with filaments of thermoplastic polymer. This combination creates a net-like structure that is highly durable but offers incredible levels of ventilation. Not only that, Aeroweave offers a supple fit, moving and cradling the foot for comfort while retaining the full support you need for a stable and efficient pedal stroke. Powerstrap PerformanceThe R2 Vento Powerstrap Aeroweave secure your foot with a simple but ingenious configuration of the traditional strap system.In order to offer stability and comfort throughout your ride, the Powerstrap system features a lightweight and reliable hook and loop strap system that pulls together the two sides of the upper. However, unlike a traditional system, the Powerstraps fully wrap around the upper. This provides even pressure across the whole foot, the ribbon wrapping around your foot for an unrivalled level of riding comfort. Another benefit is a much more aero finish than a traditional strap system. R2 Carbon OutsoleThe stiffest and lightest sole unit in the Fizik range, R2 Carbon Outsole delivers incredible responsiveness, with power transferred to your pedals with outstanding efficiency. Jump for a sprint or attack a climb and you're rewarded with immediate acceleration - only fitness is holding you back.Efficient pedalling is also optimised thanks to the cleat track position. This has been set further rearwards to improve pedalling dynamics, reduce knee compression and power transfer - it's especially well-suited to very aggressive, forward aero riding positions.Cleat GuidanceThese Cycling Shoes are compatible with road bike pedal systems that use cleats with 3-bolt standards, such as: Look Delta and Keo, Shimano SPD-SL, Speedplay Light Action, Zero, X-Series (via 3-hole adapter plate), Campagnolo Pro-Fit, Mavic Zxellium, Time Iclic/Xpresso and Time Impact.Features:Aeroweave - extremely breathable, high tenacity net-like upper structurePowerstrap - foot-wrapping Velcro closure designed for an enveloping fitR2 carbon outsole - optimized cleat positioning, high stiffness andlightness tuned for power transferR2 outsole - full carbon, stiffness index 103-bolt cleat compatible (cleats not supplied)Weight: 196g (size 42)Buy Fizik Footwear from Chain Reaction Cycles, the World's Largest Online Bike Store.
Fizik R2 Vento Powerstrap Aeroweave Road ShoesA new breed of super-light and super-ventilated racing shoes, the Fizik R2 Vento Powerstrap Aeroweave Road Shoes deliver race-winning, rival-dropping pedalling performance alongside outstanding levels of cool airflow. Fizik's engineers set themselves the task of creating a super-light shoe that made no sacrifices to foot support and pedalling performance. It also had to be incredibly breathable too. The result is the R2 Vento Powerstrap Aeroweave Road Shoes. Aeroweave TechnologyAeroweave is an innovative woven fabric, interweaving lightweight nylon fibres with filaments of thermoplastic polymer. This combination creates a net-like structure that is highly durable but offers incredible levels of ventilation. Not only that, Aeroweave offers a supple fit, moving and cradling the foot for comfort while retaining the full support you need for a stable and efficient pedal stroke. Powerstrap PerformanceThe R2 Vento Powerstrap Aeroweave secure your foot with a simple but ingenious configuration of the traditional strap system.In order to offer stability and comfort throughout your ride, the Powerstrap system features a lightweight and reliable hook and loop strap system that pulls together the two sides of the upper. However, unlike a traditional system, the Powerstraps fully wrap around the upper. This provides even pressure across the whole foot, the ribbon wrapping around your foot for an unrivalled level of riding comfort. Another benefit is a much more aero finish than a traditional strap system. R2 Carbon OutsoleThe stiffest and lightest sole unit in the Fizik range, R2 Carbon Outsole delivers incredible responsiveness, with power transferred to your pedals with outstanding efficiency. Jump for a sprint or attack a climb and you're rewarded with immediate acceleration - only fitness is holding you back.Efficient pedalling is also optimised thanks to the cleat track position. This has been set further rearwards to improve pedalling dynamics, reduce knee compression and power transfer - it's especially well-suited to very aggressive, forward aero riding positions.Cleat GuidanceThese Cycling Shoes are compatible with road bike pedal systems that use cleats with 3-bolt standards, such as: Look Delta and Keo, Shimano SPD-SL, Speedplay Light Action, Zero, X-Series (via 3-hole adapter plate), Campagnolo Pro-Fit, Mavic Zxellium, Time Iclic/Xpresso and Time Impact.Features:Aeroweave - extremely breathable, high tenacity net-like upper structurePowerstrap - foot-wrapping Velcro closure designed for an enveloping fitR2 carbon outsole - optimized cleat positioning, high stiffness andlightness tuned for power transferR2 outsole - full carbon, stiffness index 103-bolt cleat compatible (cleats not supplied)Weight: 196g (size 42)Buy Fizik Footwear from Chain Reaction Cycles, the World's Largest Online Bike Store.
Fizik R2 Vento Powerstrap Aeroweave Road ShoesA new breed of super-light and super-ventilated racing shoes, the Fizik R2 Vento Powerstrap Aeroweave Road Shoes deliver race-winning, rival-dropping pedalling performance alongside outstanding levels of cool airflow. Fizik's engineers set themselves the task of creating a super-light shoe that made no sacrifices to foot support and pedalling performance. It also had to be incredibly breathable too. The result is the R2 Vento Powerstrap Aeroweave Road Shoes. Aeroweave TechnologyAeroweave is an innovative woven fabric, interweaving lightweight nylon fibres with filaments of thermoplastic polymer. This combination creates a net-like structure that is highly durable but offers incredible levels of ventilation. Not only that, Aeroweave offers a supple fit, moving and cradling the foot for comfort while retaining the full support you need for a stable and efficient pedal stroke. Powerstrap PerformanceThe R2 Vento Powerstrap Aeroweave secure your foot with a simple but ingenious configuration of the traditional strap system.In order to offer stability and comfort throughout your ride, the Powerstrap system features a lightweight and reliable hook and loop strap system that pulls together the two sides of the upper. However, unlike a traditional system, the Powerstraps fully wrap around the upper. This provides even pressure across the whole foot, the ribbon wrapping around your foot for an unrivalled level of riding comfort. Another benefit is a much more aero finish than a traditional strap system. R2 Carbon OutsoleThe stiffest and lightest sole unit in the Fizik range, R2 Carbon Outsole delivers incredible responsiveness, with power transferred to your pedals with outstanding efficiency. Jump for a sprint or attack a climb and you're rewarded with immediate acceleration - only fitness is holding you back.Efficient pedalling is also optimised thanks to the cleat track position. This has been set further rearwards to improve pedalling dynamics, reduce knee compression and power transfer - it's especially well-suited to very aggressive, forward aero riding positions.Cleat GuidanceThese Cycling Shoes are compatible with road bike pedal systems that use cleats with 3-bolt standards, such as: Look Delta and Keo, Shimano SPD-SL, Speedplay Light Action, Zero, X-Series (via 3-hole adapter plate), Campagnolo Pro-Fit, Mavic Zxellium, Time Iclic/Xpresso and Time Impact.Features:Aeroweave - extremely breathable, high tenacity net-like upper structurePowerstrap - foot-wrapping Velcro closure designed for an enveloping fitR2 carbon outsole - optimized cleat positioning, high stiffness andlightness tuned for power transferR2 outsole - full carbon, stiffness index 103-bolt cleat compatible (cleats not supplied)Weight: 196g (size 42)Buy Fizik Footwear from Chain Reaction Cycles, the World's Largest Online Bike Store.
Fizik R2 Vento Powerstrap Aeroweave Road ShoesA new breed of super-light and super-ventilated racing shoes, the Fizik R2 Vento Powerstrap Aeroweave Road Shoes deliver race-winning, rival-dropping pedalling performance alongside outstanding levels of cool airflow. Fizik's engineers set themselves the task of creating a super-light shoe that made no sacrifices to foot support and pedalling performance. It also had to be incredibly breathable too. The result is the R2 Vento Powerstrap Aeroweave Road Shoes. Aeroweave TechnologyAeroweave is an innovative woven fabric, interweaving lightweight nylon fibres with filaments of thermoplastic polymer. This combination creates a net-like structure that is highly durable but offers incredible levels of ventilation. Not only that, Aeroweave offers a supple fit, moving and cradling the foot for comfort while retaining the full support you need for a stable and efficient pedal stroke. Powerstrap PerformanceThe R2 Vento Powerstrap Aeroweave secure your foot with a simple but ingenious configuration of the traditional strap system.In order to offer stability and comfort throughout your ride, the Powerstrap system features a lightweight and reliable hook and loop strap system that pulls together the two sides of the upper. However, unlike a traditional system, the Powerstraps fully wrap around the upper. This provides even pressure across the whole foot, the ribbon wrapping around your foot for an unrivalled level of riding comfort. Another benefit is a much more aero finish than a traditional strap system. R2 Carbon OutsoleThe stiffest and lightest sole unit in the Fizik range, R2 Carbon Outsole delivers incredible responsiveness, with power transferred to your pedals with outstanding efficiency. Jump for a sprint or attack a climb and you're rewarded with immediate acceleration - only fitness is holding you back.Efficient pedalling is also optimised thanks to the cleat track position. This has been set further rearwards to improve pedalling dynamics, reduce knee compression and power transfer - it's especially well-suited to very aggressive, forward aero riding positions.Cleat GuidanceThese Cycling Shoes are compatible with road bike pedal systems that use cleats with 3-bolt standards, such as: Look Delta and Keo, Shimano SPD-SL, Speedplay Light Action, Zero, X-Series (via 3-hole adapter plate), Campagnolo Pro-Fit, Mavic Zxellium, Time Iclic/Xpresso and Time Impact.Features:Aeroweave - extremely breathable, high tenacity net-like upper structurePowerstrap - foot-wrapping Velcro closure designed for an enveloping fitR2 carbon outsole - optimized cleat positioning, high stiffness andlightness tuned for power transferR2 outsole - full carbon, stiffness index 103-bolt cleat compatible (cleats not supplied)Weight: 196g (size 42)Buy Fizik Footwear from Chain Reaction Cycles, the World's Largest Online Bike Store.
Fizik R2 Vento Powerstrap Aeroweave Road ShoesA new breed of super-light and super-ventilated racing shoes, the Fizik R2 Vento Powerstrap Aeroweave Road Shoes deliver race-winning, rival-dropping pedalling performance alongside outstanding levels of cool airflow. Fizik's engineers set themselves the task of creating a super-light shoe that made no sacrifices to foot support and pedalling performance. It also had to be incredibly breathable too. The result is the R2 Vento Powerstrap Aeroweave Road Shoes. Aeroweave TechnologyAeroweave is an innovative woven fabric, interweaving lightweight nylon fibres with filaments of thermoplastic polymer. This combination creates a net-like structure that is highly durable but offers incredible levels of ventilation. Not only that, Aeroweave offers a supple fit, moving and cradling the foot for comfort while retaining the full support you need for a stable and efficient pedal stroke. Powerstrap PerformanceThe R2 Vento Powerstrap Aeroweave secure your foot with a simple but ingenious configuration of the traditional strap system.In order to offer stability and comfort throughout your ride, the Powerstrap system features a lightweight and reliable hook and loop strap system that pulls together the two sides of the upper. However, unlike a traditional system, the Powerstraps fully wrap around the upper. This provides even pressure across the whole foot, the ribbon wrapping around your foot for an unrivalled level of riding comfort. Another benefit is a much more aero finish than a traditional strap system. R2 Carbon OutsoleThe stiffest and lightest sole unit in the Fizik range, R2 Carbon Outsole delivers incredible responsiveness, with power transferred to your pedals with outstanding efficiency. Jump for a sprint or attack a climb and you're rewarded with immediate acceleration - only fitness is holding you back.Efficient pedalling is also optimised thanks to the cleat track position. This has been set further rearwards to improve pedalling dynamics, reduce knee compression and power transfer - it's especially well-suited to very aggressive, forward aero riding positions.Cleat GuidanceThese Cycling Shoes are compatible with road bike pedal systems that use cleats with 3-bolt standards, such as: Look Delta and Keo, Shimano SPD-SL, Speedplay Light Action, Zero, X-Series (via 3-hole adapter plate), Campagnolo Pro-Fit, Mavic Zxellium, Time Iclic/Xpresso and Time Impact.Features:Aeroweave - extremely breathable, high tenacity net-like upper structurePowerstrap - foot-wrapping Velcro closure designed for an enveloping fitR2 carbon outsole - optimized cleat positioning, high stiffness andlightness tuned for power transferR2 outsole - full carbon, stiffness index 103-bolt cleat compatible (cleats not supplied)Weight: 196g (size 42)Buy Fizik Footwear from Chain Reaction Cycles, the World's Largest Online Bike Store.
Fizik's engineers set themselves the task of creating a super-light shoe that made no sacrifices to foot support and pedalling performance. It also had to be incredibly breathable too. The result is the R2 Vento Powerstrap Aeroweave Road Shoes. Aeroweave Technology Aeroweave is an innovative woven fabric, interweaving lightweight nylon fibres with filaments of thermoplastic polymer. This combination creates a net-like structure that is highly durable but offers incredible levels of ventilation. Not only that, Aeroweave offers a supple fit, moving and cradling the foot for comfort while retaining the full support you need for a stable and efficient pedal stroke. Powerstrap Performance The R2 Vento Powerstrap Aeroweave secure your foot with a simple but ingenious configuration of the traditional strap system. In order to offer stability and comfort throughout your ride, the Powerstrap system features a lightweight and reliable hook and loop strap system that pulls together the two sides of the upper. However, unlike a traditional system, the Powerstraps fully wrap around the upper. This provides even pressure across the whole foot, the ribbon wrapping around your foot for an unrivalled level of riding comfort. Another benefit is a much more aero finish than a traditional strap system. R2 Carbon Outsole The stiffest and lightest sole unit in the Fizik range, R2 Carbon Outsole delivers incredible responsiveness, with power transferred to your pedals with outstanding efficiency. Jump for a sprint or attack a climb and you're rewarded with immediate acceleration - only fitness is holding you back. Efficient pedalling is also optimised thanks to the cleat track position. This has been set further rearwards to improve pedalling dynamics, reduce knee compression and improve power transfer - it's especially well-suited to very aggressive, forward aero riding positions. Cleat Guidance These Cycling Shoes are compatible with road bike pedal systems that use cleats with 3-bolt standards, such as: Look Delta and Keo, Shimano SPD-SL, Speedplay Light Action, Zero, X-Series (via 3-hole adapter plate), Campagnolo Pro-Fit, Mavic Zxellium, Time Iclic/Xpresso and Time Impact.
Fizik R2 Vento Powerstrap Aeroweave Road ShoesA new breed of super-light and super-ventilated racing shoes, the Fizik R2 Vento Powerstrap Aeroweave Road Shoes deliver race-winning, rival-dropping pedalling performance alongside outstanding levels of cool airflow. Fizik's engineers set themselves the task of creating a super-light shoe that made no sacrifices to foot support and pedalling performance. It also had to be incredibly breathable too. The result is the R2 Vento Powerstrap Aeroweave Road Shoes. Aeroweave TechnologyAeroweave is an innovative woven fabric, interweaving lightweight nylon fibres with filaments of thermoplastic polymer. This combination creates a net-like structure that is highly durable but offers incredible levels of ventilation. Not only that, Aeroweave offers a supple fit, moving and cradling the foot for comfort while retaining the full support you need for a stable and efficient pedal stroke. Powerstrap PerformanceThe R2 Vento Powerstrap Aeroweave secure your foot with a simple but ingenious configuration of the traditional strap system.In order to offer stability and comfort throughout your ride, the Powerstrap system features a lightweight and reliable hook and loop strap system that pulls together the two sides of the upper. However, unlike a traditional system, the Powerstraps fully wrap around the upper. This provides even pressure across the whole foot, the ribbon wrapping around your foot for an unrivalled level of riding comfort. Another benefit is a much more aero finish than a traditional strap system. R2 Carbon OutsoleThe stiffest and lightest sole unit in the Fizik range, R2 Carbon Outsole delivers incredible responsiveness, with power transferred to your pedals with outstanding efficiency. Jump for a sprint or attack a climb and you're rewarded with immediate acceleration - only fitness is holding you back.Efficient pedalling is also optimised thanks to the cleat track position. This has been set further rearwards to improve pedalling dynamics, reduce knee compression and power transfer - it's especially well-suited to very aggressive, forward aero riding positions.Cleat GuidanceThese Cycling Shoes are compatible with road bike pedal systems that use cleats with 3-bolt standards, such as: Look Delta and Keo, Shimano SPD-SL, Speedplay Light Action, Zero, X-Series (via 3-hole adapter plate), Campagnolo Pro-Fit, Mavic Zxellium, Time Iclic/Xpresso and Time Impact.Features:Aeroweave - extremely breathable, high tenacity net-like upper structurePowerstrap - foot-wrapping Velcro closure designed for an enveloping fitR2 carbon outsole - optimized cleat positioning, high stiffness andlightness tuned for power transferR2 outsole - full carbon, stiffness index 103-bolt cleat compatible (cleats not supplied)Weight: 196g (size 42)Buy Fizik Footwear from Chain Reaction Cycles, the World's Largest Online Bike Store.
Fizik R2 Vento Powerstrap Aeroweave Road ShoesA new breed of super-light and super-ventilated racing shoes, the Fizik R2 Vento Powerstrap Aeroweave Road Shoes deliver race-winning, rival-dropping pedalling performance alongside outstanding levels of cool airflow. Fizik's engineers set themselves the task of creating a super-light shoe that made no sacrifices to foot support and pedalling performance. It also had to be incredibly breathable too. The result is the R2 Vento Powerstrap Aeroweave Road Shoes. Aeroweave TechnologyAeroweave is an innovative woven fabric, interweaving lightweight nylon fibres with filaments of thermoplastic polymer. This combination creates a net-like structure that is highly durable but offers incredible levels of ventilation. Not only that, Aeroweave offers a supple fit, moving and cradling the foot for comfort while retaining the full support you need for a stable and efficient pedal stroke. Powerstrap PerformanceThe R2 Vento Powerstrap Aeroweave secure your foot with a simple but ingenious configuration of the traditional strap system.In order to offer stability and comfort throughout your ride, the Powerstrap system features a lightweight and reliable hook and loop strap system that pulls together the two sides of the upper. However, unlike a traditional system, the Powerstraps fully wrap around the upper. This provides even pressure across the whole foot, the ribbon wrapping around your foot for an unrivalled level of riding comfort. Another benefit is a much more aero finish than a traditional strap system. R2 Carbon OutsoleThe stiffest and lightest sole unit in the Fizik range, R2 Carbon Outsole delivers incredible responsiveness, with power transferred to your pedals with outstanding efficiency. Jump for a sprint or attack a climb and you're rewarded with immediate acceleration - only fitness is holding you back.Efficient pedalling is also optimised thanks to the cleat track position. This has been set further rearwards to improve pedalling dynamics, reduce knee compression and power transfer - it's especially well-suited to very aggressive, forward aero riding positions.Cleat GuidanceThese Cycling Shoes are compatible with road bike pedal systems that use cleats with 3-bolt standards, such as: Look Delta and Keo, Shimano SPD-SL, Speedplay Light Action, Zero, X-Series (via 3-hole adapter plate), Campagnolo Pro-Fit, Mavic Zxellium, Time Iclic/Xpresso and Time Impact.Features:Aeroweave - extremely breathable, high tenacity net-like upper structurePowerstrap - foot-wrapping Velcro closure designed for an enveloping fitR2 carbon outsole - optimized cleat positioning, high stiffness andlightness tuned for power transferR2 outsole - full carbon, stiffness index 103-bolt cleat compatible (cleats not supplied)Weight: 196g (size 42)Buy Fizik Footwear from Chain Reaction Cycles, the World's Largest Online Bike Store.
4iiii 105 R7000 Left Arm Power MeterThis Left Arm Power Meter from 4iiii offers exceptional support when training. It relays your riding output directly to your suitable device, so you can track your efficiency and always be ready to up your game. Compatible with Shimano 105 R7000 systems, it utilises ANT+ and Bluetooth technology to give you accurate data within +/- 1%. What's more, it measures the tri-axial strain to give you accurate speed readings making this Power Meter the ideal piece to add to your training kit. Features:Crank Arm: Shimano 105 R7000 AlloyAccuracy: +/- 1% error marginBattery Life: 100+ hours on 2032 coin cell batteryConnectivity: ANT+, BluetoothWarranty: 3 yearsWeight: 9gBuy 4iiii Components from Chain Reaction Cycles, the World's Largest Online Bike Store.
Making the most of its ability to measure tri-axial strain, this innovative crank arm gives precise readings to within +/-1% to keep you committed to shaving off the seconds. Bluetooth and ANT+ compatible, it will relay your riding data to your compatible mobile device or onboard computer, allowing you to analyse and adapt your ride at any given time. With over 100 hours of usage from the included battery, this easy-to-install 4iiii Power Meter 105 will keep you riding as efficiently and effectively as possible, ride-after-ride. If the weather or climate makes riding outdoors tough, this item can be used with all popular indoor-training apps, such as Zwift, TrainerRoad, Wahoo SYSTM, Rouvy, and more. Simply use your favourite app's connection procedure over ANT+ or Bluetooth Smart, put your bike on a trainer, and get riding. Please Note: This is the non-drive side crank arm only, it is designed to be used along with your existing drive side crank arm (chainring side).
Whether you’re a pro or simply training hard, PRECISION powermeters deliver industry-leading accuracy, highly dependable cadence data, 3D powermeter technology capable of measuring tri-axial strain on your crank arm. Designed to be durable and lightweight, compatible with ANT+ and Bluetooth head units, PRECISION helps you train harder and smarter.PRECISION Ride Ready comes installed on a new Shimano left crank arm (105, Ultegra, or Dura-Ace). These crank arms will fit bottom brackets using the Hollowtech ii interface. Key Features: 3D powermeter technology (patent pending) measures tri-axial strain on your crank arm, Accurate, consistent data, Lightweight, compact design, Battery status indicator via 4iiii app, Compatible with ANT+, Bluetooth Smart head units, smartphones, and other 4iiii products, User-friendly app and configurable rider compensation scale factor, Easy setup and maintenance, . Specifications: Weight: 9 grams, Data accuracy: +/- 1% error margin, Battery life: 100+ riding hours on 2032 coin cell battery.