Brompton Derailleur chain pusher assembly - QCHPUA

Brompton chain pusher

The Brompton derailleur mechanism which pushes the chain tensioner wheels between the two rear sprockets on a two or six speed Brompton - it works in conjunction with the DR style chain tensioner

The chain tensioner has not changed from the pre-2017 to the 2017 onwards integrated shifter derailleur

This video from Brompton shows how to correctly set up the 2/6 speed derailleur system.

Brompton Q part code: QCHPUA
Brompton part number: 9012169