Shimano Ultegra CS-R8101 12-Speed Cassette 11-34T
£119.99
Skip to product information
Shimano Ultegra CS-R8101 12-Speed Cassette 11-34T
£119.99
- 4.9 from 782 Google reviews
- Independent Bike Dealer of the Year 2025, BikeBiz Awards
- UK delivery from £4.99, or free collection from our Bow shop at E3 3XS.
- Checked by our team before it leaves us
Collecting instead? Email us or message us on WhatsApp before you visit, so we can have it ready for you.
Climbing range without compromise.
The Ultegra CS-R8101 delivers Hyperglide+ shifting performance with an 11-34T range that gives you a genuine bailout gear for hills without sacrificing top-end speed. Fits both 12-speed and road 11-speed freehub bodies, so upgrading from 11-speed doesn't necessarily mean new wheels.
Why We Chose This for Our Customers:
- 11-34T range with 12 sprockets: 11-12-13-14-15-17-19-21-24-27-30-34
- Hyperglide+ technology for seamless shifts under load
- Compatible with both HG 11-speed and HG-L2 12-speed freehub bodies
- Refined shift ramps work with both Di2 and mechanical 12-speed systems
- Approximate weight: 345g
Fitment: Shimano 12-speed road and gravel drivetrains (Ultegra R8100, 105 R7100, GRX RX820).
Ideal for: Riders upgrading to Ultegra-level 12-speed, or anyone wanting wider gear range for UK hills.