Used - New - Consignment. Shimano FC-R8100 Ultegra Crank Set 52/36t 12 speed 175mm Compatible Di2. This is a display Crankset in the bike shop located on the display case, box was thrown away. Brand new 12 speed Crankset mid compact 52/36 with 175 mm crank arms.An integral part of the Shimano Ultegra 12-speed road lineup, the FC-R8100 crankset builds upon Shimano's 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 specific biomechanic requirements. Optimal balance of stiffness, strength, weight and rotational performance. Hollowglide structure cuts weight yet maintains strength for better power transfer and quicker, more precise front shifting.