Brompton Chain Tensioner Assembly

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Genuine Brompton derailleur chain tensioner assembly for 2- and 6-speed models.This can be identified by the fact it has 2 identical looking black jockey wheels where the chain sit s in a groove in the jockey wheel.This works as a chain tensioner (keeping the chain tight when riding and folded) and as part of the Brompton designed derailleur mechanism - by having juckey wheels which can move from side to side to allow the chain to move between the two rear sprockets. Specification Part code: QCTADR Part number: 9023011 Show more