Brompton standard chain tensioner...
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Brompton standard chain tensioner idler (jockey wheel) set (pair) for Brompton bikes with no derailleur
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Brompton chain tensioner replacement jockeys wheels
This is a replacement pair of jockey wheels for the chain tensioner (sometimes called a derailleur even though on this model it is not - it just keeps the chain tension correct when riding and folded)
For use on single, three and five speed Bromptons (i.e. for Bromptons with a standard - non-derailleur - chain tensioner)
A new set (pair) of Jockey / idler wheels for the chain tensioner.
Brompton Q part code: QCTIDL
Brompton part number: 9023073