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1/8th width sprockets with 3 splines, and these haven’t been made for ages now.
I beg to differ.
https://www.sjscycles.co.uk/sprockets/brompton-sprocket-13t-r-3-mm-3-spd-for-1-18-inch-chain-iso/
https://www.sjscycles.co.uk/sprockets/sturmey-archer-24t-sprocket-18-dished-cp-hsl876/
https://www.amazon.co.uk/Sturmey-Archer-14t-coaster-brake-cog/dp/B003RLE95G
M_V
jj72
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.