Left crank arm power meter
4iiii Precision 3+ 105 R7100 Left Crank Arm Power Meter
A genuine Shimano 105 R7100 left crank with 4iiii's Precision 3+ strain gauge fitted at the factory. Swap it for your existing left arm and you have power and cadence data for barely any extra weight.
Highlights
Why we rate it
Simple swap
Arrives ready to ride on a 105 R7100 arm, so fitting is just a left-crank change.
Long battery life
Runs up to 800 hours on a standard CR2032 coin cell you can buy anywhere.
Dual-band connection
Talks to head units, apps and smart watches over ANT+ and Bluetooth at the same time.
Apple Find My
Can be added to Apple's Find My network to help track the meter, and your bike, if it goes missing.
Tech specs
Specification
Manufacturer specification. Details may change without notice.
Specification
- Compatibility
- Shimano 105 R7100 cranksets (left arm replacement)
- Measurement
- Left (non-drive side) only
- Added weight
- 9g
- Battery life
- Up to 800 hours
- Accuracy
- ±1%
- Connectivity
- ANT+ and Bluetooth Smart
- Battery
- CR2032 coin cell
- Profile
- 5.5mm
- Power range
- 0–4,000W
- Cadence range
- 30–170rpm
- Water resistance
- IPX7
- Operating temperature
- 0–50°C
- Warranty
- 3 years
In the box
- Includes
- Shimano 105 R7100 left crank arm with Precision 3+ power meter installed, CR2032 battery
Ordering
Available from The Cycle Collective
Available to order through The Cycle Collective in Dorking. For availability, setup or advice, call 0203 148 6764 or email hello@thecyclecollective.cc.