Used great condition. 4iiii power meter. Single sided, left side 172.5mm left crank. Works perfectly. Selling because I purchased power meter pedals. This came off my shimano ultegra 11 speed crankset (FC-R8000) but it is made for the 12 speed version (FC-R8100) It is compatible with many of the Shimano hollowtech cranksets in both 11 and 12 speed versions.
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