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Replacement chain tensioner assembly for Brompton bicycles without a derailleur (so your single, three or five speed Brompton).
This can be easily identified by the silver (dirt may change the colour!) metal disc on the longer of the two arms.
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Warning: Last items in stock!
The Brompton chain tensioner is one of the "essential" list of spare parts for Bromptons with a single rear sprochet and performs an important role in keeping the chain taut whether the bike is being ridden or in the folded/parked position.
This chain tensioner internally geared hubs where only one single rear cog / sprocket is fitted (1-speed, 3-speed or the older 5-speed).
The chain tensioner shouldn't be done up too tight (just over hand tight - approx 5NM for Sturmey Archer and approx 8NM for SRAM hubs) or you will crack the plastic of the chain tensioner.
Instructions for the tensioner are included - or you can see them in the downloads tab.
Brompton Q part code: QCTA
Brompton part number: 9023004