The seamless shifting of the ULTEGRA R8100 12-speed cassette allows the rider to fully concentrate on ascents, sprints, or enjoyable cruising, without having to worry about the next gear change. Cogs with more teeth ensure higher drive efficiency and guarantee compatibility with SHIMANO 11- and 12-speed FREEHUB freehub bodies. HYPERGLIDE+ cassettes set new standards for shifting in off-road use due to seamless gear changes when shifting up or down across the entire gear range. It is time for this technology to also be used in road bikes. Even under maximum force during climbs or in a direct duel with an opponent, shifting is now possible. In all gears, the ULTEGRA R8150 drivetrain provides maximum efficiency thanks to larger teeth and ensures compatibility with existing HYPERGLIDE FREEHUB freehub bodies. Despite its expansion to 12 speeds, ULTEGRA CS-R8100 cassettes set new standards in road bike shifting systems.