SHIMANO Ultegra R8101 Cassette - 12-Speed - 11-34t Sunshine_Enriched Lightweight in-mold construction fuses the

Lightweight in-mold construction fuses the exterior shell and EPS foam for a one-piece design that's lightweight and durable

they’ll help breathe new life into older bikes

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custom-tuned EVA midsole provides an improved grip and feel as you pedal

thru axle 12x142mm

SHIMANO Ultegra R8101 Cassette - 12-Speed - 11-34t Sunshine_Enriched Lightweight in-mold construction fuses theThe uninterrupted shifting experience of the Shimano Ultegra CS R8100 12 speed cassette range lets you climb, sprint, or cruise without stopping to think about your next gear change. Larger driving cogs maximize drivetrain efficiency and create compatibility with both Shimano 11 and 12 speed freehub bodies. Shimano HYPERGLIDE+ technology is integrated to provide seamless shifts both up and down the gear range. Refined 12 step gear combination provides