Ultegra 12-speed crankset
Shimano Ultegra FC-R8100 Crankset
Ultegra's 2x12 crankset brings Dura-Ace style hollow construction to a more approachable price, with a stiff hollow outer ring and forged hollow arms. A sensible upgrade or replacement for any R8100 build.
Highlights
Why we rate it
HollowGlide outer ring
A hollow-section big ring resists flex under load, keeping front shifts quick and positive even when you shift mid-effort.
Hollow forged arms
Cold-forged Hollowtech II arms keep weight down while delivering the stiffness you would expect from Shimano's second-tier group.
Choice of gearing
Pick 52-36T for fast group rides, 50-34T for general use or 46-36T for steep climbs and rougher roads.
Short lengths available
Arm lengths start at 160mm, which helps smaller riders and anyone running a more aggressive position.
Shared standards
Uses the same 24mm Hollowtech II axle and 110mm asymmetric BCD as Dura-Ace, so bottom brackets and many spares are interchangeable.
Tech specs
Specification
Manufacturer specification. Details may change without notice.
Specification
- Model code
- FC-R8100
- Series
- Ultegra R8100
- Speeds
- 2x12
- Chainrings
- 50-34T, 52-36T, 46-36T
- Crank lengths
- 160, 165, 170, 172.5, 175mm
- BCD
- 110mm asymmetric 4-arm
- Q-factor
- 148mm
- Chainline
- 44.5mm
- Axle
- 24mm Hollowtech II
- Weight
- Approx. 700g (170mm, 50-34T)
- Bottom bracket
- Hollowtech II, e.g. BB-R9100, SM-BB92-41B or SM-BB72-41B (sold separately)
- 46-36T compatibility
- Requires FD-R8150 or FD-R9250 front derailleur
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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Close all zippers before washing
Wash at max 30°C
Hand washing with cold water (or gentle wash cycle)Using mild, high quality detergent
Drip drying in shade, do not machine dry
Avoiding ironing and bleachThe instructions on your garment’s label
Sorting your clothing by color
Avoiding fabric softener.
Our clothing isn’t meant to be dry cleaned and soaking clothing is not ideal
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
Vegan & vegetarian friendlyCruelty free, not tested on animals
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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