4iiii Precision 105 R7000 Left Crank Power Meter 170mm
£160
The sensor is located on the inside of the left 105 R7000 crank arm. This crank arm fits of course on a 105 R7000 crankset, but also fits other Hollowtech II race cranksets like the 105 FC-5800, Ultegra R8000 and Dura-Ace R9100.