DJC Stone Bearing Pulley Wheel Gear Guide Roller Jockey 10t 11t 13t 15t 17t MTB Road Bike Rear Derailleur for Shimano for Sram over sized ordinary tooth pulley

Features
Body made by Polyoxymethylene (POM) high strength resin,stiffness but lightweight. High precision CNC process.
Sealed stainless bearing 689RS, it is a customized low sideplay bearing. Offer smooth riding and low noisy.
Ordinary Tooth. Fit for 9/ 10/11 /12 speed chain. Weight: 9g/10g/12g/15g, Thickness: 8mm.
Broadly compatibility: works for Shimano and Sram Derailleurs, and other brand Derailleurs. MTB, road bike. Install hole diameter: 6mm (compatible with 4/5mm)
1 Year Warranty. Package Content: 1* pulley wheel, 1* adapter for 4mm to 6mm, 1* adapter for 5mm to 6mm

Tooth OD(mm) Weight(g) Fit for
11T 44mm 8g 95% short Rear Derailleur
13T 52mm 10g long arm down part
15T 59mm 12g for SGS down part
17T 68mm 15g for SGS down part

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.