# Galets de dérailleur arrière Shimano Deore XT 12v RD-M8100/M8120

**Brand:** Shimano
**Category:** Sport & fitness
**Code (GTIN/SKU):** 4550170521790
**Canonical URL:** https://openreviews.io/en/reviews/shimano/galets-de-derailleur-arriere-shimano-deore-xt-12v-rd-m8100-m8120-4550170521790

## Rating: 4.7/5 ★★★★★ — 33 reviews analyzed
_Confidence: high_

## At a glance

Galets de dérailleur arrière Shimano Deore XT 12v RD-M8100/M8120 reviews: 4.7/5 based on 33 analyzed reviews from 3 sites, updated November 2, 2026.

Praised: backward compatibility and reduced play.

33 reviews analyzed, all published on other sites.
Other sites: 3 sources, 33 reviews, average rating 4.7/5.
How we count reviews: https://openreviews.io/en/methodology

## AI summary

These 13-tooth derailleur jockey wheels are designed to effectively replace worn parts on Shimano 12-speed drivetrains. Users particularly appreciate the sealed bearings, which guarantee smooth operation and excellent pedaling fluidity. They also stand out for their superior stiffness, offering significantly less play than the SLX range version, which helps restore optimal shifting precision.

## Strengths

- **Backward compatibility** — These jockey wheels install perfectly as replacements on SLX range derailleurs.
- **Reduced play** — The XT version design offers a more precise fit and less play than lower-end models.
- **Smooth rotation** — The integrated sealed bearings ensure very smooth operation of the drivetrain.

## Frequently asked questions

- Are they compatible with an SLX derailleur?
- How many teeth do these jockey wheels have?
- Are the bearings sealed?
- Do they offer an improvement over the original jockey wheels?

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_Source: OpenReviews — https://openreviews.io/en/reviews/shimano/galets-de-derailleur-arriere-shimano-deore-xt-12v-rd-m8100-m8120-4550170521790_