GANOPPER Bike Ceramic Bearing Pulley Rear Derailleur 12T 14T 16T 18T Road Bike Guide Roller Idler 4mm 5mm 6mm For shimano sram GX XX1  11V 12V Jockey Wheel Bike Part

Feature:

(1) AL7075-T6 Alloy Machined  Narrow Wide Teeth

(2) Stainless Steel Shell& Ceramic Bearing Ball For Axis ,More durable and resistant

(3) Copper Bushing :4mm/5mm

(4) Extra Free Pulley Screw

Weight: approx 14.9g(12T)
Colors: Blue, Gold, Red, Black,Green

Installation aperture: 4mm,5mm

Installation thickness: 8.5mm

Fit for: 9/10/11/12 speed Shimano Sram Road bike Mountain Bike , MTB Rear Derailleur
Diameter:

         50mm(12T), 58mm(14T), 68mm(16T),77mm(18T)

Packaging includes:

1pcs  Rear Derailleur Pulley

1pcs 4mm Adapter

1pcs 5mm Adapter

1pcs Pulley Screw

1>Stainless Steel Shell ,more durable , compared with nylon shell ,  nylon shell is easy to break after 100 miles travel

2>Narrow Wide Teeth Design, Prevent the horizontal swing of the chain

3>Copper Bushing ,High Hardness ,Improve Life Time16T For

(1) Shimano 8800RD--6800 6870/6770/9000/9070,  

(2) Shimano 8700RD--5800/5700/4600/4700/105/6600,

(3) Shimano RD--R8000 etc.,

18T For Shimano R7000/R8000/R8050/R8070/R9170/R9150/R9100 etc.,