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Replacement chain tensioner assembly for Brompton bicycles with a derailleur (2 speed or 6 speed)
This can be identified by the fact it has 2 identical looking black jockey wheels where the chain sits in a groove in the jockey wheel.
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Brompton chain tensioner - for 2 and 6 speed Brompton folding bikes
For Bromptons with 2 speed, 6 speed SRAM or 6 speed Sturmey Archer / BWR (Brompton Wide Ratio), this works as a chain tensioner (keeping the chain tight when riding and folded) and as part of the Brompton designed derailleur mechanism.
For details of how to adjust the Brompton derailleur, check out this technical video from Brompton.
Fitting instructions are included or can be viewed in the downloads tab
Brompton Q part code: QCTADR
Brompton part number: 9023011
If you have a single, three or five speed Brompton (i.e. no derailleur) then you need the standard chain tensioner (QCTA)