# Dérailleur arrière vélo Shimano GRX RD-RX812 11v pour mono plateau **Brand:** Shimano **Category:** Sport & fitness **Code (GTIN/SKU):** 4550170448882 **Canonical URL:** https://openreviews.io/en/reviews/shimano/derailleur-arriere-velo-shimano-grx-rd-rx812-11v-pour-mono-plateau-4550170448882 ## Rating: 4.5/5 ★★★★★ — 12 reviews analyzed _Confidence: high_ ## At a glance Dérailleur arrière vélo Shimano GRX RD-RX812 11v pour mono plateau reviews: 4.5/5 based on 12 analyzed reviews from 2 sites, updated November 2, 2026. Praised: shifting precision and shadow RD+ technology. 12 reviews analyzed, all published on other sites. Other sites: 2 sources, 12 reviews, average rating 4.5/5. How we count reviews: https://openreviews.io/en/methodology ## AI summary This rear derailleur is designed specifically for 1x single-chainring setups on Gravel bikes. It is particularly appreciated for its exemplary reliability and the smoothness it brings to gear shifts. Shifting precision is greatly improved thanks to the integration of Shadow RD+ technology, which effectively stabilizes the chain. Its proven technical compatibility with Shimano 105 11-speed shifters greatly facilitates conversions and the optimization of existing drivetrains. No recurring weaknesses or concerns are reported by users. ## Strengths - **Shifting precision** — Gear shifts are significantly smoother, faster, and more precise across all sprockets. - **Shadow RD+ technology** — The integrated chain stabilizer limits bounce and secures the drivetrain on rough terrain. - **Cross-compatibility** — The derailleur works perfectly in combination with Shimano 105 11-speed levers. ## Frequently asked questions - Is it compatible with Shimano 11s road shifters? - Is the Shadow RD+ technology effective for challenging Gravel riding? - Can it be easily installed on a 1x drivetrain? - Does shifting remain smooth in the mud? --- _Source: OpenReviews — https://openreviews.io/en/reviews/shimano/derailleur-arriere-velo-shimano-grx-rd-rx812-11v-pour-mono-plateau-4550170448882_