Medium Cage Rear Derailleur

RD-6870-GS - Medium Cage Rear Derailleur image

The Shimano RD-6870-GS is the medium cage rear derailleur for the 6870 series. It supports a max front difference of 16T, a low sprocket minimum of 28T and a low sprocket maximum of 32T. The top sprocket maximum is 12T and the minimum is 11T. It has a total capacity of 37T and weighs only 11g more than the short cage derailleur - 268g.

It also features Shimano's Crash Protection Mode - this prevents shifting after a crash to make sure the rear derailleur is damaged any further. To restore shifting functionality have a look at our FAQ I had a small crash and my rear derailleur stopped working. What happened?

Details & Specifications

Model number:
268 g
E-Tube ports:
E-Tube Port type:
Rear Derailleur
Ultegra 6870 (Road)

Shopping links

Are you looking to upgrade your bike using this component or tool? I've added links to this component's shopping pages. If you make any purchase using the links below you'll support the site - at no cost to you.