Shimano Ultegra FC-R8100 172.5mm 52-36T w/LH 4iii Powermeter

Introducing the all new 4iiii PRECISION 3+ Shimano Ultegra R8100 Power Meter. 4iiii has combined their patent pending 3-D tri-axial strain gauge technology, measured at +/- 1.0% accuracy, with Shimano’s 12-speed Ultegra R8100 groupset. The result is one of the lightest, most affordable and most accurate direct force power meters available.

The PRECISION determines your total power based on the force that is generated by your left leg. This left-only design allows for a power meter that is lightweight and easy to install. Specifically, the power meter adds only 9 grams to your crank arm and is installed in about 10 minutes. In addition, the PRECISION is compatible with both ANT+ and Bluetooth SMART devices. This means you can use it with your favourite bicycle computer, watch or smart phone.

This crank is attached to an integral part of Shimano's new 12-speed road lineup, the FC-R8100 crank builds upon Shimano's legendary front shifting and transmission efficiency. With new refinements for seamless 12-speed shifting. HOLLOWGLIDE structure cuts weight yet maintains strength for better power transfer and quicker, more precise front shifting.