Folding Bike Chain Guide Single-Disc 2/3/6 Speed Rear Derailleur Chain Tensioner for Inner Outer Shi

Installation Specifications: Support Single Speed\/2 Speed\/3 Speed\/6 Speed Internal and External Transmission Can Be Used.This product uses 7075 locking screws to increase the locking strength and strength. The return spring and guide wheel bearings are replaced with stainless steel! ! !Waterproof and rustproof, fearless in the face of bad weather.Don't worry about rusting due to weather, which increases the service life.Function:Play The Function Of Adjusting Rear Speed During Riding. The Horizontal Center Bearing Reduces Wear and Tear, and At The Same Time Increases The Tension Of The Chain, Making It Difficult to Drop.Colour:blackMaterial:6061 aluminum alloy + stainless steel bearingPackage Contents:2 * tower wheels1 set * installation componentsOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +\/- 1-3cm.