Shimano 12-speed (Deore M6100, SLX M7100, XT M8100, XTR M9100) offers a massive 510% gear range with a 10-51T cassette. No more need for a double chainring on MTB.
But it's not just "adding a cog" — several components are incompatible.
| Component | 11sp | 12sp | Compatible? |
|---|---|---|---|
| Freehub body | HG | Micro Spline | NO |
| Cassette | 11-46T | 10-51T | NO |
| Chain | HG 11sp (5.62mm) | HG+ 12sp (5.25mm) | NO |
| Derailleur | 11sp Shadow+ | 12sp Shadow+ | NO |
| Shifter | 11sp | 12sp | NO |
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L'Atelier Assistant
Source: Official workshop manuals
For cross-brand compatibility rules, check our SRAM/Shimano compatibility guide.
L'Atelier tells you in 3 seconds if your wheels accept Micro Spline. Try free.
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