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Shimano Ultegra FC-R8100 Crankset - 172.5mm 12-Speed 52/36t Hollowtech II Spindle Interface BLK MPFN-BAA0074K }Fizik Vento Argo R1 AdaptiveShimano Ultegra FC R8100 Crankset 172. 5mm 12 Speed 52 36t Hollowtech II Spindle Interface Black. An integral part of the Shimano Ultegra 12 speed road lineup the FC R8100 crankset builds upon Shimanos legendary front shifting and transmission efficiency. With new refinements for seamless 12 speed shifting the Ultegra crank is now offered in a wide variety of lengths bringing performance and improved fit for smaller riders triathletes and riders with