Dura-Ace Di2 rear mech
Shimano Dura-Ace RD-R9250 Di2 Rear Derailleur
The heart of the semi-wireless Dura-Ace R9200 system: a 12-speed Di2 rear mech that houses the charging port and wireless unit, and shifts noticeably quicker than any Shimano mech before it. One cage covers 11-28T through to 11-34T cassettes.
Highlights
Why we rate it
Brain of the system
Wireless receiver, charging port, LED status light and function button all live in the mech, so there is no separate junction box or wireless unit to fit.
Quicker shifting
A stronger motor and revised linkage cut rear shift times significantly over the previous 11-speed Dura-Ace Di2 mech.
One cage for every cassette
A single cage length handles everything from tight 11-28T race cassettes up to 11-34T climbing ratios, which keeps stocking and spares simple.
Carbon cage plates
The carbon-reinforced pulley cage keeps weight down while staying stiff enough for crisp, accurate indexing.
Impact protection
A built-in saver clutch lets the motor gearbox give way in a crash rather than strip, protecting the internals.
Tech specs
Specification
Manufacturer specification. Details may change without notice.
Specification
- Model code
- RD-R9250
- Speeds
- 12
- Actuation
- Di2 (semi-wireless, battery-in-frame)
- Max low sprocket
- 34T
- Min low sprocket
- 28T
- Top sprocket
- 11T
- Cage
- Single length, Shadow RD, carbon cage plates
- Pulleys
- 11T with cartridge bearings
- Ports
- 1 x EW-SD300 E-Tube, 1 x charging port
- Chain
- Shimano HG 12-speed
- Weight
- 215g (claimed)
- Compatible levers
- ST-R9270 (wireless)
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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