Ultegra 12-speed cassette
Shimano Ultegra CS-R8101-12 12-Speed Cassette
The current Ultegra 12-speed cassette, revised so it works with both Di2 and mechanical 12-speed Shimano road groups. It suits Ultegra, 105 and GRX 2x drivetrains in a close 11-30T or a climbing-friendly 11-34T.
Highlights
Why we rate it
Works with mechanical and Di2
The R8101 revision replaces the original CS-R8100 and is specified for both electronic and cable-operated 12-speed Shimano road groups.
Hyperglide+ shifting
Shift ramps and tooth profiles guide the chain across sprockets cleanly, cutting shift time noticeably compared with older Hyperglide.
Sensible weight saving
Steel sprockets sit on two aluminium carriers, keeping weight down without the cost of titanium.
Road and gravel ranges
11-30T for tight road spacing, or 11-34T for big climbs and 2x gravel setups.
Wide wheel compatibility
Fits Shimano 12-speed road and conventional 11-speed road freehub bodies.
Tech specs
Specification
Manufacturer specification. Details may change without notice.
Specification
- Model code
- CS-R8101-12
- Speeds
- 12
- Ratios
- 11-30T, 11-34T
- 11-30T sprockets
- 11-12-13-14-15-16-17-19-21-24-27-30
- 11-34T sprockets
- 11-12-13-14-15-17-19-21-24-27-30-34
- Weight
- 291g (11-30T), 345g (11-34T)
- Materials
- Steel sprockets, two aluminium carriers, aluminium lockring
- Freehub
- Shimano HG road 12-speed (HG L2) and road 11-speed
- Compatible derailleurs
- RD-R9250, RD-R8150, RD-R7150, RD-R7100 (11-34T), RD-RX820
- Chain
- Shimano 12-speed HG+ (CN-M8100 recommended)
- Replaces
- CS-R8100-12
In the box
- Includes
- Cassette
- Includes
- Lockring
Ordering
Available from The Cycle Collective
Available to order through The Cycle Collective in Dorking. For availability, setup or advice, call 0203 148 6764 or email hello@thecyclecollective.cc.
Product Information
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Hand washing with cold water (or gentle wash cycle)Using mild, high quality detergent
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Storage
Unused sealed sachets should be stored inside the box in a well-ventilated, dry place and protected from moisture, heat and direct sunlight. Can be stored for up to 3 years.
Size
Each sachet contains 30g powder.2 x 30g sachets per carton box.
Makes 2x litres of bike cleaner
100% plastic free packaging
Readily biodegradable ingredients
100% water free
Refill your old bottle and help reduce plastic waste
92% saving in packaging compared to 2 x 1L bike cleaner
100% environmentally friendly ingredients, including plant based raw materials
Supplied in a compostable sachet and printed with vegetable inks
FSC recycled card box containing 2 x sachets – that makes 2L of bike cleaner
Safe on all parts and surfaces including carbon fibre
Will not harm seals, cables, disc brake pads or rotors
Alkaline based and free from alcohol, CFCs, EDTA, solvents or acids
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Sachet Instructions
1. Grab your empty old bottle of Muc-Off. (You may need a pair of adjustable pliers to remove the trigger from the bottle). Or purchase our Bottle for Life.
2. Fill up to the shoulders of the bottle with 1 litre of lukewarm water for faster formula activation!
3. Carefully cut one corner of the sachet open along the diagonal cut lines.
4. You can carefully pour the sachet straight into the top of the bottle. Or using the box, fold the inside of the lid together using the printed lines as a guide and use this as a funnel to pour the powder into your bottle. (Please see our video for full instructions on this.
5. Screw your spray trigger back onto the top of the bottle. Ensure it’s tight!
6. Shake the bottle vigorously for 30-60 seconds to activate the formula. If you notice any undissolved powder simply keep shakin’ it!
7. Go clean that filthy bike!
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