Shimano XT CS-M8100-12 12-speed Cassette

  • Shimano XT CS-M8100-12 12-speed Cassette - Components - front - Shimano - - - - Speedlab
  • Shimano XT CS-M8100-12 12-speed Cassette - Components - back - Shimano - - - - Speedlab


Shimano XT CS-M8100-12 12-speed Cassette


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With the Shimano XT CS-M8100-12 cassette you can tackle every trail
With the Shimano XT CS-M8100 12-speed cassette you have the choice between a 10-45 t and a 10-51 t version. If you want to keep your gear jumps as low as possible, then the 10-45 gradation is the right one for you. If you want to cover as much range as possible, use the 10-51 option. Of course, all CS-M8100-12 cassettes feature Shimano Hyperglide+ technology for high shifting speed, precision and smoothness when shifting up or down. Noise is also minimised in this way. Weight reduction, robustness and durability are further enhanced by the aluminium spider construction and the two largest sprockets, which are also made of aluminium.

Application: Enduro, All Mountain, Cross Country
Gearing: 12-speed
Gradation: 10-45, 10-51
Sprocket Material: steel, aluminium
Freehub Body Compatibility: Shimano Micro Spline

Technical Information:
Series: Deore XT M8100
Spider: 1 (aluminium)
Recommended Chain: HG 12-speed (e.g. CN-M8100)

- 12-speed Hyperglide+ cassette
- 10-51: Wide range version, 10-45: Rhythm step version
- for 1/2x12-speed
- fast and precise shifting performance optimised for any type of trail
- pedal during the shifting process
- lighter and stiffer construction reduces inertia and improves acceleration (Beam Spider)
- 10 t sprocket as smallest sprocket, possible due to new freehub construction (Micro Spline)
- sprockets 1 to 10 made of steel (plated), 11 and 12 made of aluminium (anodised)
- sprocket carrier made of painted aluminium, anodised lock ring

With Hyperglide+, you don't have to interrupt pedalling while the drivetrain is shifting to effortlessly manage trails where conditions change from one second to the next. You'll get the support you need to master almost any terrain, while the propulsion system always provides you with the right shifting options to enjoy your ride untroubled.

Micro Spline
Micro Spline reduces the weight with a lightweight freehub, whereby the smallest sprocket
has 10 teeth. The ride stability is increased by 30 %. A 7.6° angle (max.) ensures fast response. Micro Spline freehubs can only be used in combination with Micro Spline cassettes and rear hubs.

- Gradation: 10-12-14-16-18-21-24-28-32-36-40-45 t

-Weight: 461g approx.
- Manufacturer Part Number: I-CSM8100045

- Gradation: 10-12-14-16-18-21-24-28-33-39-45-51 t

-Weight: 470g approx.
- Manufacturer Part Number: I-CSM8100051

- 1 x Shimano XT CS-M8100-12 cassette
- 1 x Shimano aluminium lockring


What freehub do I require for the Shimano XT 12 speed MTB cassette?
The Shimano XT 12 speed MTB cassette uses the Shimano MICRO SPLINE freehub body.

What is the available gear range for the Shimano XT 12 speed MTB cassette?
The Shimano XT 12 speed MTB cassette is available in 10-45T and 10-51T.

What makes the Shimano XT 12 speed MTB cassette a performance part?
The Shimano XT 12 speed MTB cassette features HYPERGLIDE+ tooth profile that lets you pedal continuously while shifting and has increased acceleration by reducing inertia and weight by BEAM SPIDER construction

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SPEEDLAB ships from Monday to Friday with the exception of public holidays. We ship complete orders only, i.e. the dispatch usually takes place as soon as all ordered items are ready for dispatch. Please contact the SPEEDLAB service team if you wish a partial delivery.


Depending on destination country, package size, volume and weight, SPEEDLAB ships with the carriers German Post, DHL, German parcel service, DPD, USP. Deliveries of bulky goods, for example complete bicycles, will be handled by selected forwarding companies.

For return shipments SPEEDLAB cooperates with German Post, DHL and DPD. Large bulky goods like bicycles will be picked up by a forwarding company.

In Germany and most European countries the are shipped with DHL, Hermes, DPD, UPS, German Post.




  • Germany 5,99 Euro DHL / DPD / Hermes / German post
  • Rest of Europe: 13,99 Euro (DHL, DPD, Hermes)
  • Rest of world: 29,99 Euro DHL
  • Cash on Delivery + 4,9 €


For all items marked with this symbol, which are ordered on business days from Monday to Friday by 3 p.m. (CET), we offer the DHL Express shipping option or UPS for selected delivery countries. The DHL Express&UPS option is subject to an additional surcharge. It can be selected during the ordering process, provided that all items in the shopping cart offer the Express option. In addition the DHL Express option must be available for the selected delivery adress.

An order within the EU usually arrives the following business day. Depending on the postal code of the delivery address, longer parcel delivery times may occur.


  • Germany 15 Euro (DHL, UPS, TNT)
  • Rest of Europe – 49 EURO (DHL, UPS, TNT )
  • Rest of world – on request

In-stock items will be shipped within Germany in 1-2 working days, within Europe and worldwide in 1-3 working days. Unfortunately the delivery at a certain date given by you is not possible due to logistic reasons.

Should the ordered item not be in stock, the delivery time is extended analogue to the delivery in our warehouse. Information regarding the availability can be obtained at +49-7022-9-777-818 or

Please note: The ordered goods may be subject to a partial delivery.

Import Taxes, Customs Duties and Fees / National VAT

The indicated prices including VAT. In addition to the calculated SPEEDLAB shipping costs customers not living in the EU have to pay the national VAT and duty in their country for the imported goods.

Transport Damage

If you receive a damaged shipment please refuse the receipt if possible. Anyway, please get in touch with the Bike24 service team by e-mail or phone as soon as possible. We will be happy to solve the issue.


The SPEEDLAB team will do its best to fulfill your change requests.

The wish to cancel must be declared within 14 days after receipt of the goods. The return must take place within 14 days after the declaration of the cancellation.

Before the actual dispatch of your order, it can still be canceled. Please send us your request as soon as possible using the contact form or call us by phone. Should the payment have been charged already, it will be refunded in a timely manner.

Pack everything you want to return to SPEEDLAB carefully and include your order number. Remove the old shipping label and attach the return label to the package. You can return the package at DHL and Hermes stations. For all other countries: Please contact us with your return request and our customer service will arrange the process. Usually, SPEEDLAB covers the return costs.

A return will be processed at SPEEDLAB within a few working days. Once your request has been successfully processed it will be confirmed by e-mail. A possibly necessary refund will be processed directly afterwards.


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