Like a fine wine, some things are worth waiting for and the new Shimano XTR M9100 12-Speed Rear Derailleur has certainly been worth the wait. Proven Shadow RD+ technology keeps the mech out of harm's way while delivering shifts so smooth, you'll need a jazz soundtrack to accompany your riding. The cold forged aluminium body is both supremely light and incredibly hard wearing - this is not delicate 'one race' bit of kit. A carbon front plate and alloy back make the Shimano XTR M9100 12-Speed Rear Derailleur' cage light, stiff and durable. Designed to work with the new 'Rhythm' XTR double chainset, the Shimano XTR M9120 is ready to offer the widest gear range of any MTB rear mech anywhere. The new 10 tooth upper jockey wheel reduces noise, with a rubber anti-chain buzz cushion making the mech quieter still. Meanwhile the big 13 tooth lower jockey wheel, with fully sealed bearings, makes the jump from 10 all the way up to 45 teeth completely trouble free. To experience the shifting that you have been waiting for, the Shimano XTR M9100 12-Speed Rear Derailleur is the only 12 speed mach your bike will ever need.


  • Shadow RD + technology
  • Cold forged aluminium body
  • Carbon outer cage plate
  • Rubber anti-chain buzz cushion
  • 13 tooth large/ 10 tooth small sprockets
  • 10-45T (2x12-speed) compatibility
  • Sealed sprocket bearings
  • Long and medium cage options
  • 237/240g (GS/SGS) weight

Shimano XTR M9120 12-Speed Double Rear Derailleur


Barcode: 4524667880264

Like a fine wine, some things are worth waiting for and the new Shimano XTR M9100 12-Speed Rear Derailleur has certainly been worth the wait. Proven Shadow RD+ technology keeps... Read more

£176.95 RRP £214.99SAVE 17%


Delivery Information

We have a range of delivery options on orders. Most importantly, if your order is over £50 then delivery is free!

All Biketart orders are fully trackable. You will get a tracking number by email when your order is shipped which will allow you to track it with Royal Mail or DPD.

In-stock orders placed by 4pm will be processed the same day.

Any items displaying "in-stock with supplier, despatched in 2-3 days" on the product page cannot be despatched the same day as they will be shipped to us from the supplier when you place your order.

Read on to discover the delivery options available to you on your order.

Delivery Services

Standard Tracked: All orders over £50 are eligible for free standard tracked delivery by Royal Mail. For orders under £50 there is a £2.99 charge. Orders sent using standard tracked are usually delivered in 2-3 days.

Priority Tracked: For £3.99 your order is sent by premium tracked delivery which gives a 1-2 day (including Saturdays) delivery timescale. This service is provided by Royal Mail who will usually deliver on Saturdays. Orders must be placed by 4pm.

Next Day Courier: If you require next-working-day delivery then this is provided by DPD and is £6.99. Orders must be placed by 3.30pm and be fully in-stock in order to be processed before our daily DPD collection.

Saturday Delivery: You can select Saturday delivery options from DPD at the checkout.

Bike Delivery: Bikes are always delivered by courier. After placing a bike order your bike is fully assembled and tested before being carefully boxed for shipping. Because of this build process it is not always possible to offer next-day delivery on a bike. Please do get in touch if you want to know a specific despatch day on any bike on our website. Call us on 01227 832582 or email

Returns Info

We offer a 30 day return period on our items. We ask that items are returned in their original packaging and in re-sellable condition. We do not pay returns postage.unless we have made an error with your order.

We cannot accept the return if the item is not correctly packaged and is damaged in transit during the return trip back to us.

    Please do not stick any tape or labels to the products branded outer packaging.

      If you require an exchange it is recommended that you re-order the correct size/item and return the item you do not wish to keep to us for a refund.

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