Shimano CS-R7100 105 12 Speed CassetteWith tough steel cogs and an aluminium spider, this road bike cassette is designed for maximum durability and performance on every mile. Part of Shimano's pioneering R7100 series, this 12 speed model also comes equipped with an 11-34T ratio, making it perfect for everything from sprinting on the flat to climbing steep inclines on your road bike. Its refined 12-step gear combination also ensures excellent efficiency, so none of your effort is wasted. You'll experience faster, smoother shifts under maximum torque (pedalling force) and shifts so smooth you'll barely notice them, whether you're biking uphill, downhill or rolling on the flats. Compatible with both Shimano 11 and 12 speed freehub bodies, this cassette is a versatile choice of upgrade for conquering your next road journey.12 Speed Cassette with Hyperglide TechnologyThe distinctively designed Hyperglide sprockets incorporate specially positioned shift ramps and tooth profiles for improved chain control during shifting. Fast and responsive indexed shifting is the result. The HG cassette sprocket, which was developed for the mountain bike (MTB) 10 speed system, underwent comprehensive optimisation to achieve super-highly efficient shifting for road cycling.Features: Cogs Material: Steel Spider Material: Aluminium Speed: 12 Speed Chain Compatibility: HG 12 speed Freehub Compatibility: Shimano 11 and 12 speed freehub bodies Tooth Count: 11-34T Tooth Combination: 11-12-13-14-15-17-19-21-24-27-30-34T Weight: 361gManufacturer's Part Numbers: CSR710012134 Black 12 SpeedA 2-year warranty is offered with all Shimano products from Chain Reaction Cycles (3 years on Dura-Ace and XTR products).Buy Shimano Components from Chain Reaction Cycles, the World's Largest Online Bike Store.