What Is It?
The Shimano CS-R8101 Ultegra 11-34T 12-Speed Cassette is a premium Hyperglide+ (HG+) road cassette engineered for the Shimano Ultegra R8100 12-speed groupset. Designed to deliver exceptionally fast, smooth, and precise shifting, it provides seamless gear changes even under heavy pedalling loads.
The 11-34T gear range offers an excellent balance of closely spaced gears for maintaining an efficient cadence on the flats while providing a generous low gear for steep climbs. Built with nickel-plated steel sprockets mounted on two lightweight aluminium spider arms, the cassette combines durability, stiffness, and reduced weight for performance-focused road and endurance cyclists. It is compatible with Shimano's HG L2 12-speed road freehub, allowing it to fit modern Shimano 12-speed road wheelsets.
Key Benefits
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Hyperglide+ Technology: Ultra-fast, smooth shifting both up and down the cassette, even under load.
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Wide 11-34T Gear Range: Makes steep climbs easier while maintaining efficient top-end gearing.
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Lightweight Construction: Two anodised aluminium spider arms reduce weight and increase stiffness.
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Nickel-Plated Steel Sprockets: Provide outstanding durability and corrosion resistance.
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Optimised Gear Progression: Smooth gear spacing helps maintain an efficient cadence.
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Race-Proven Performance: Designed for demanding road cyclists and endurance riders.
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HG L2 Freehub Compatibility: Fits Shimano 12-speed road freehub bodies while remaining compatible with many existing 11-speed road wheelsets.
Specifications
| Specification |
Details |
| Product |
Shimano CS-R8101 Cassette |
| Series |
Ultegra R8100 |
| Speed |
12-Speed |
| Gear Range |
11-34T |
| Tooth Combination |
11-12-13-14-15-17-19-21-24-27-30-34T |
| Technology |
Hyperglide+ (HG+) |
| Sprocket Material |
Nickel-plated Steel |
| Spider Arms |
2 × Anodised Aluminium |
| Lockring Material |
Anodised Aluminium |
| Average Weight |
Approximately 345 g
|
| Freehub Compatibility |
Shimano HG L2 (12-speed Road) |
| Compatible Chain |
Shimano HG 12-speed |
| Application |
Road, Endurance Road, Gravel |
Who Is This Best Suited For?
The Shimano CS-R8101 Ultegra 11-34T 12-Speed Cassette is ideal for:
- Road cyclists
- Endurance riders
- Gravel riders
- Competitive racers
- Gran Fondo participants
- Club cyclists
- Riders tackling hilly or mountainous terrain
- Cyclists upgrading or replacing an Ultegra R8100 12-speed cassette
- Performance riders seeking a lightweight cassette with an excellent climbing gear
Compatibility Note: The CS-R8101 11-34T is compatible with Shimano Ultegra R8100, Dura-Ace R9200, and 105 R7100 12-speed road drivetrains when paired with a Shimano HG 12-speed chain. It fits Shimano's HG L2 12-speed road freehub standard, which is compatible with many existing Shimano 11-speed road wheelsets.
