18T Hollow Jockey Wheel 12‑Speed Ceramic Bearing Rear Derailleur Pulley For Shimano R9200 R9250 R8100 R7000 Road Bike

18T Eccentric Single Derailleur Pulley with Full Ceramic Balls is a high-performance upgrade part for mountain bike and road bike rear derailleur.

This 18T oversized single pulley adopts hollow CNC aluminum alloy structure and high-speed Full Ceramic Balls, effectively reducing transmission friction, improving pedaling efficiency and shifting smoothness.

It is the perfect replacement for your stock jockey wheel, lower pulley, rear derailleur pulley.

-compatible:

magene (qed)

shimano 10s:rd-5700-gs/rd-6600-gs/rd-6700-gs/rd-7800/rd-7900/rd-7970 (note that it is notcompatible with short-leg rear derailleur)

Shimano 11s: r9100/r8000/r8050/r7000 series

Shimano 12s:r9200/r9250/r8100/r8150rd-r7100/rd-r7150 series

Does not support lg long legs (some models with notches may not becompatible. please confirm your rear derailleur compatibility before

purchasing)

Notice

(Shimano 11 speed long legs not applicable    (Some parts with card slots cannot be installed, please confirm your rear paddle before purchasing)  SRAM not applicable  

1. A 1-speed chain is compatible if it fits properly.Thread the chain onto the jockey wheel first; if every tooth engages correctly, it is supported.

2. Some rear derailleurs have clearance issues and cannot fit larger jockey wheels.If it can be installed, it can be used.

3. The rest is just adjusting the position; proper adjustment prevents chain drops.

4. A severely worn chain will also cause the chain to drop.