The Shimano Ultegra CS-R8101 11-34T 12-speed Road Cassette brings smooth, precise shifting to every ride. Thanks to HYPERGLIDE+ technology, gear changes feel seamless, whether you're climbing a steep hill or pushing hard on a sprint. No need to ease off your effortevery shift happens quickly and effortlessly. With 12 gears, it offers a wider range for tackling climbs, descents, and flat stretches with ease. Larger cogs improve efficiency, letting you ride longer and stronger. Compatibility with existing HYPERGLIDE freehub bodies ensures you can upgrade without overhauling your setup. Built for reliability and performance, it redefines what smooth shifting feels like, letting you focus on the ride ahead.Features:- Refined 12 step gear combination provides peak efficiency and accelerating performance for every racing situation- Faster, smoother shifts under maximum pedaling force- Compatible with new 12-speed and road 11-speed FREEHUB body-11-12-13-14-15-17-19-21-24-27-30-34T- Compatible chain HG 12-speed

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