Brompton derailleur mechanism which pushes the chain tensioner wheels between the two rear sprockets on a two speed 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 – so is compatible with all year Bromptons (as long as it has the hexagonal braise on the rear triangle for connecting the wing plate).
Complete with wing plate.






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