Over time, dust, mud, and gritty trail debris take a toll on your rear derailleur's jockey wheels, leading to sluggish shifts, increased drivetrain noise, or dropped chains under load. This authentic Shimano replacement set is engineered to handle the unique, harsh demands of mixed-terrain adventures, keeping your gear transitions crisp and completely predictable.
The set features an optimised combination of an 11-tooth guide pulley (upper) and a 13-tooth tension pulley (lower). This asymmetric design ensures exact chain management and minimises mechanical friction, allowing you to transfer maximum power to the rear wheel whether you are grinding up a steep fire road or tackling technical singletrack.
Optimised Tooth Profiling: Uses a specific 11T upper guide pulley and 13T lower tension pulley design for perfect 11-speed chain engagement and fluid movement.
Sealed Industrial Bearings: High-quality sealed bearings ensure an exceptionally smooth rotation while delivering robust protection against water, mud, and trail grit.
Durable Composite Construction: Crafted from a high-strength, wear-resistant plastic and metal blend built to survive demanding off-road riding environments.
Model Code: WP-Y3GE98010
Compatibility: Shimano GRX RD-RX810 and RD-RX815 11-speed rear derailleurs (typically 2x configurations)
Tooth Count: 11-tooth (Guide Pulley) / 13-tooth (Tension Pulley)
✅ Restores Factory Shifting: Ideal if your gravel bike has logged thousands of kilometres and is suffering from heavy, vague, or noisy gear changes.
✅ Genuine Shimano Precision: Guarantees absolute compatibility and original equipment performance without the indexing issues often caused by third-party alternatives.
✅ Low Maintenance: The sealed industrial bearing design drastically reduces workshop time by keeping harsh environmental contaminants out.
❌ Not For 1x Specific Setups: If you are running the 1x11 gravel setup with the GRX RD-RX812 derailleur, you will need a dual 11T pulley kit instead.
❌ Requires Tool Competency: You will need a hex key and basic mechanical knowledge to back out the cage bolts and install the wheels properly.
❌ Standard Performance Focus: Riders chasing ultra-lightweight setups or ceramic modifications will find these standard composite replacements too utility-focused.
When installing your new jockey wheels, pay close attention to the arrows stamped on the plastic faces. The lower tension pulley is directional and must rotate in the correct direction for smooth chain path alignment. Also, use a tiny drop of medium thread-locker on the pulley bolts during reassembly so they don't slowly vibrate loose on rough corrugated gravel roads!
