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Cheers for the history lesson. That's really interesting.
It's a pain, but as he doesn't use it much it's not that big a deal. Just a shame that the service can't include a new chain and sprockets.
Still he having marathons fitted so that's probably worth the cost of the service alone.
hugo7-
Just a shame that the service can't include a new chain and sprockets.
A 3-speed conversion to use a new chain and sprocket still seems feasible. Checking the parts list for the SA replacement 3-speed sprocket kit against the old SRAM/SACHs one shows that they both take the same three-spline 3mm width sprocket. So, if you could get a secondhand set of the spoke guard and two 2.2mm spacers from a discarded SACHS 3-speed set up, you should be able to use a new SA sprocket with those parts.
SRAM/SACHS sprocket parts diagram for QRSPRSTACK-SR3-13:
https://issuu.com/bromptonbicycle/docs/qrsprstack-sr3-13-14_asand SA parts diagram for QRSPRSTACK-SA3-13:
https://issuu.com/bromptonbicycle/docs/qrsprstack-sa-13-14_as
Nick_S
I had this only last week with a customer. The 6 speed Sachs hub used 1/8th width sprockets with 3 splines, and these haven’t been made for ages now. SA 2 and 6 speed hubs use 3/32th width sprockets with 9 splines, which are freely available. We managed to find a supply of larger 1/8th sprockets a while back, but they’re only the larger ones, 15 and 16t. A Brommie needs 13 or 14t too, and they’re just not available.
SRAM bought Sachs out and stopped production some years back. Brompton only briefly used the Sachs hub when SA went belly up about 15 or so years ago, until SunRace bought SA and started producing the hubs again after a two-year break.
So in short the shop is calling it straight. It’s not Brompton’s fault, but SRAM. The only way is to replace the rear wheel, I’m afraid.