Shimano Tension & Guide Pulley Set Rd-Rx810/815
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The Shimano GRX RD‑RX810 / RD‑RX815 Tension & Guide Pulley Set is the official Shimano replacement pulley (jockey wheel) kit used for 11-speed GRX gravel rear derailleurs, covering both mechanical and Di2 versions.
What it is
This is a replacement pulley wheel set for:
- Shimano GRX RD‑RX810 (mechanical 11-speed)
- Shimano GRX RD‑RX815 (electronic 11-speed)
It includes:
- Guide pulley (upper jockey wheel)
- Tension pulley (lower jockey wheel)
What it does
These two pulleys are responsible for:
-
Guide pulley
- directs chain into each gear cleanly
- ensures accurate shifting response
-
Tension pulley
- maintains chain tension
- stabilises drivetrain under pedalling load
Together they keep the GRX system:
- smooth
- quiet
- precise under gravel vibration and load
Compatibility
This set is designed specifically for:
- GRX RX810 / RX815 11-speed systems only
It is not compatible with:
- newer 12-speed RX820 systems
- MTB derailleurs
- road 12-speed R-series systems
(Shimano pulley geometry is speed- and cage-specific.)
Key characteristics
- Genuine Shimano OEM part
- Designed for gravel vibration resistance
- Directional pulley design (must be installed correctly)
- Engineered tooth profile for chain retention under rough terrain
When to replace
You should replace these pulleys when:
- shifting becomes noisy or imprecise
- chain starts “skipping” under load
- pulley teeth become hooked or worn
- bearings feel rough or gritty
GRX-specific design purpose
Compared to standard road pulleys, GRX versions are tuned for:
- mud and dust resistance
- chain stability on rough gravel
- better chain retention over bumps
- reduced drivetrain noise under load
Bottom line
The Shimano GRX RD-RX810/RX815 pulley set is a precision OEM replacement kit for 11-speed GRX gravel derailleurs, restoring smooth shifting, chain stability, and quiet drivetrain performance in rough and variable terrain.
