The Shimano Ultegra FC-R8100 chainset maintains the same quick, precise front shifting and efficient power transfer that Shimano riders have grown accustomed to. The R8100 chainset now cater to smaller riders, triathletes, and cyclists curious about shorter crank arms. Features 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. 52-36 and 50-34 chainring options. . 160, 165, 170, 172.5, and 175 mm crank arm lengths..
