Stone Pulley Wheel Gear Guide Roller Jockey 10t 12t 14t 16t Bearing Road MTB Bike Rear Derailleur for GX XX1 for Shimano M9000

Name: Stone Pulley Wheel, narrow wide tooth
Material: POM high strength resin, NSK bearing
Bearing: Japan NSK 689
Tooth: 10T/12T/14/16T

Weight: 9g/10g/12g/15g
Thickness: 8mm
Inner diameter: 6mm (compatible with 4/5mm)
Color: black wheel with black cover, black wheel with red cover
Fit for: 9 10 11 12 speed, for Shimano and Sram Derailleur(most)
Package: 1* pulley wheel, 1*bolt adapter for 4mm to 6mm, 1*bolt adapter for 5mm to 6mm

Advice to customer want to modification:
1. If you are single chainring, recommend change to narrow wide tooth. Performance will better

2. More tooth means more likely to round, but only recommend add 1 tooth. For example, if you are using 11T, the max you can change is 12T. 13T is too big for you.

Tooth OD(mm) Weight(g) Fit for
10T 43.1mm 9g Short arm leg
12T 52mm 10g Most middle and long arm
14T 58mm 12g Some long arm
16T 65.5mm 15g Very less long arm

Polyoxymethylene (POM), also known as acetal, polyacetal, and polyformaldehyde, is an engineering thermoplastic used in precision parts requiring high stiffness, low friction, and excellent dimensional stability.

POM is characterized by its high strength, hardness and rigidity to −40 °C.

Typical applications for POM include high-performance engineering components such as small gear wheels, eyeglass frames, ball bearings, ski bindings, fasteners, guns, knife handles, and lock systems. The material is widely used in the automotive and consumer electronics industry.