Stone 12s Pulley Wheel Guide Jockey 10t 12t 14t 16t Bearing Road MTB Bike Rear Derailleur for Sram GX XX1 for Shimano Hollow Aero

STONE Narrow Wide Rear Derailleur Pulley Wheel for MTB

Ride Smoother • Shift Quieter • Last Longer

Why Choose STONE Pulley Wheels

✔ Low Noise Riding
Precision CNC POM construction reduces drivetrain noise and vibration.

✔ Better Chain Control
Narrow-wide tooth profile helps improve chain retention and shifting stability.

✔ Sealed Bearing Technology
Smooth rolling performance with lower friction and improved efficiency.

✔ Lightweight Upgrade
Available in Cutout and Solid styles. Lightweight design without sacrificing strength.

✔ Easy Maintenance
Replaceable bearing design allows quick servicing and longer product life.

✔ Multiple Size Options
10T / 12T / 14T / 16T

✔ Wide Compatibility
Suitable for many Shimano and SRAM MTB rear derailleurs.

Technical Specifications

Material: POM Engineering Plastic

Bearing Type: Sealed Steel Bearing

Thickness: 8mm

Mounting Hole: 6mm

Included Adapters: 4mm / 5mm / 6mm

Color Options:

Black Pulley + Red Cover

Black Pulley + Black Cover

Package Includes

1 x Pulley Wheel
or

2 x Pulley Wheels

Recommended Upgrade

Upper Pulley:
Increase by no more than +1T from the original pulley size.

Lower Pulley:
Increase by +1T to +2T for smoother chain movement and reduced friction.

Compatibility Notice

Compatible for Shimano MTB for SRAM MTB rear derailleurs.

Not compatible for SRAM AXS Flattop road chains.

For Shimano 12-speed road chains, using an aftermarket quick link is recommended for optimal compatibility.