Shimano Ultegra R8101 12spd. Cassette

Elevate your road drivetrain with the Shimano Ultegra R8101 12‑Speed Cassette — engineered to deliver smooth, responsive shifting and proven Shimano reliability. Part of the Ultegra R8100 series, this cassette uses Hyperglide+ technology to provide seamless shifts under load and a refined gear progression that’s ideal for everything from long climbs to high‑speed sprints.

Key Features

• Hyperglide+ Shifting Technology: Precision‑designed tooth profiles and ramps give fast, reliable shifting under power — up or down the cassette.
• Optimized 12‑Step Gear Progression: Available in 11‑30T and 11‑34T ranges for versatile performance across varied terrain.
• Wide Compatibility: Works with Shimano 12‑speed HG chains and fits both new road 12‑speed (HG‑Spline L2) and many existing 11‑speed freehub bodies.
• Lightweight Road Performance: Designed for road cyclists who demand efficient power transfer and crisp cadence changes during training rides and races. pdl.bike
• Durable Construction: Built to Shimano’s quality standards for long‑lasting performance ride after ride. pdl.bike

📏 Specifications

• Model: CS‑R8101‑12
• Speeds: 12
• Compatibility: Shimano HG 12‑speed chain; compatible with Shimano 12‑speed and many 11‑speed freehub bodies
• Type: Hyperglide+ road cassette

Why Riders Love It

Whether you’re racing, exploring rolling hills, or commuting at speed, the Shimano Ultegra R8101 cassette delivers smooth, confident shifting and versatile gear options. Its refined gear steps and lightweight design help you maintain cadence and momentum across flats, climbs, and descents — making it an excellent choice for performance‑oriented cyclists upgrading or replacing their road drivetrain.

Perfect for pairing with Ultegra R8100 cranksets and derailleurs, as well as other 12‑speed Shimano road groupsets.