Workarounds for Brompton SRAM 6 speed sprocket replacement

General cycling advice ( NOT technical ! )
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MartinC
Posts: 2127
Joined: 10 May 2007, 6:31pm
Location: Bredon

Workarounds for Brompton SRAM 6 speed sprocket replacement

Post by MartinC »

My eldest son inherited my Brompton 6 speed SRAM hubbed Brompton. He uses it a lot and the chain and sprockets need replacing. The sprockets and driver were Brompton specific and no longer available. It must be 10 year or more since they swopped to the SA hub which uses a 9 spline driver for the 2 sprockets rather than the traditional 3 dog type. The SRAM hub has a non-standard (and non-available) driver to take 2 sprockets - a 2mm thick 3/32" 15 tooth, a 3/32" 13 tooth with a built in spacer and a 2mm spacer between.

It seems there are 2 easy solutions to this:
- replace the hub with the current SA version - expensive but future proofed
- put a single 1/8" sprocket on with enough spacers for it to fit and run 3 speed 'til it dies.

Does anyone know any other workarounds to this? e.g. is there a combination of standard 3 dog sprockets and spacers that others have found to work as a 6 speed?
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