ULTEGRA FC-R8100 crank retains long-standing fast and precise front shifting performance and high-efficiency power transmission, ULTEGRA crank lengths range from 160 to 175 mm to accommodate smaller riders, triathletes and cyclists. The FC-R8100 crank is part of the new 12-speed road bike product line, built with the legendary front shifting and transmission efficiency. ULTEGRA cranks are the next evolution in seamless 12-speed shifting and are available here in the 170 mm crank lengths and 50/34T compact chainring ratio to provide performance and optimal fit for smaller riders