The Ultegra Hollow Tech II Crankset features an optimized lightweight design that doesn't sacrifice stiffness.
Wider gear pitch increases clearance between chain and leading teeth. Redesigned, stiffer crank arms inspired from Dura Ace R9100 Hollow arms and large chainring Better compatibility with disc brake frames Compatible with shorter chainstays (410mm) on frames with 135mm or 142mm spacing Compatible only with FD-R9100 and FD-R8000 Weight: 674g