Shimano Ultegra CS-R8101 Cassette - 12-Speed | 11-34t Flat Pedals Works with both Shimano Rear

Works with both Shimano Rear Direct Mount and standard 10x1 dropout hanger frames

so you're not shortchanged on fit just because you're starting with the Classic 3

rattle-free connection to frames with a braze-on front derailleur tab

The Pirelli Scorpion Enduro R is the rear-specific enduro tire built for full-suspension bikes on aggressive terrain where grip and durability under hard braking and acceleration are non-negotiable

Shimano also makes this BB in Italian threading for frames with 70mm Italian threaded shells

Shimano Ultegra CS-R8101 Cassette - 12-Speed | 11-34t Flat Pedals Works with both Shimano RearWhy Is the Shimano Ultegra CS R8101 the Go To 12 Speed Cassette for Serious Road Riders? The Shimano Ultegra CS R8101 brings HYPERGLIDE+ technology to Ultegra level riders, enabling uninterrupted shifting under full pedaling load whether climbing, sprinting, or accelerating out of corners. Larger driving cogs maximize drivetrain efficiency and the cassette is compatible with both Shimano 11 speed and 12 speed freehub bodies, making it a clean upgrade