Shimano XT 1x12-speed Upgrade Kit

  • Shimano XT 1x12-speed Upgrade Kit - Upgrade Kits - Shimano - - - - Speedlab
  • Shimano XT 1x12-speed Upgrade Kit - Upgrade Kits - derailleur - front - Shimano - - - - Speedlab


Shimano XT 1x12-speed Upgrade Kit


Price incl. VAT excl. Local Import Taxes & Shipping Costs.

BTBF Members Qualify for a 5% Discount


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ComThe Shimano XT Upgrade Kit - Your entry into the 12-speed world
The Shimano XT 1x12 Upgrade Kit enables all those who do not ride a Shimano crank to enter the world of 12-speed shifting with Shimano. It includes the rear derailleur RD-M8100, the shifter SL-M8100-R, the chain CN-M8100 and the cassette CS-M8100-12 in the gradation 10-45 or 10-51 t. With the rear derailleur you can choose between clamp and I-Spec EV mounts.


Series: Deore XT M8100
Application: Enduro, All Mountain, Cross Country
Gearing: 12-speed (mechanical)

Technical Information - Cassette:
Type: Deore XT CS-M8100-12 (Hyperglide+)
Gearing: 12-speed
Gradation: 10-12-14-16-18-21-24-28-32-36-40-45 t, 10-12-14-16-18-21-24-28-33-39-45-51 t
Sprocket Material: steel (sprocket 1 to 10), aluminium (sprockets 11 and 12)
Freehub Body Compatibility: Shimano Micro Spline
Spider: 1 (aluminium)

Technical Information - Rear Derailleur:
Type: Deore XT RD-M8100 or RD-M8120 long (SGS)
Mount: standard
Capacity: 41 tooth (RD-M8100), 45 tooth (RD-M8120)
Largest Sprocket Teeth (max.): 51 tooth (RD-M8100), 45 tooth (RD-M8120)
Largest Sprocket Teeth (min.): 51 tooth (RD-M8100), 45 tooth (RD-M8120)
Smallest Sprocket Teeth (max.): 10 teeth
Smallest Sprocket Teeth (min.): 10 teeth
Chainring Difference (max.): 0 tooth (RD-M8100), 10 tooth (RD-M8120)
Compatibility: Shimano MTB 12-speed
Derailleur Pulleys: 13 tooth
Outer Cage Material: aluminium
Inner Cage Material: aluminium
Other Materials: aluminium, stainless steel, steel, composite (GFRP)

Technical Information - Chain:
Type: Deore XT CN-M8100 (HG)
Number of Links: 126
Closure Type: master link (Quick-Link)
Pin Type: solid
Directional: yes
Material: steel

Technical Information - Shifter:
Type: Deore SL-M8100 or SL-M8100-I (Rapidfire Plus)
Mount: clamp (closed) or I-Spec EV
Body Material: aluminium
Lever Material: aluminium (main lever), composite (GFRP) + steel (release lever)
Cable: stainless steel (Optislick)
Cable Housing: OT-SP41
Adjustment Options: cable adjust, position adjust (I-Spec EV only), rotation adjust (I-Spec EV only)
Features: Instant Release, Multi Release, 2-Way Release

Freehub / Rear Hub: Shimano Micro Spline. Various manufacturers offer conversion kits.

Brake Lever: According to Shimano, only I-Spec EV, but there are adapter solutions for I-Spec (B) or I-Spec II from other manufacturers, e.g. Wolf Tooth.

Chainring: Shimano 12-speed or a chainring made for Shimano Hyperglide+ 12-speed.


- 1 x Shimano XT CS-M8100-12 cassette
- 1 x Shimano XT RD-M8100 rear derailleur or RD-M8120 Shadow+
- 1 x Shimano XT CN-M8100 chain
- 1 x Shimano XT SL-M8100 shifter or (SL-M8100-I mm, right)
- 1 x Shimano cable (2050 mm)
- 1 x Shimano cable housing
- 3 x 6 mm sealed end caps
- 1 x long nose end cap
- 1 x Shimano aluminium lockring
- 1 x Shimano SM-CN910-12 Quick-Link master link



 10-51T, CLAMP BAND: 1114g approx

10-51T, I-SPEC EV: 1117g approx


Will this work on my bike?
See our infographic for help choosing an upgrade kit for your bike.

Does this include a crankset and/or chainring?
No. You may be able to use the crankset or chainring on your existing bike. See our upgrade kit infographic for more information.

Do I need to replace my chain when I replace the cassette?
Use a chain wear tool to check the wear on your chain. If the chain is more than 0.5% worn it is recommendable to replace the chain as it will accelerate the wear on the cassette

Is this product suitable for e-bike use?

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Hands of Hope

Your Purchase does good, gives back and makes a lasting impact. 5% of profits of all products is donated to the Joyce Meyer Hands of Hope Initiative. No cost to you.

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With Your Purchase of any Helmet, you contribute to placing more Homes on Heads. Make a lasting impact to those who are homeless, or who may have lost their homes due to any national disaster. 5% of profits of helmets gets donated to the Joyce Meyer Ministries who will help us with this Initiative. No cost to you.

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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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