I have a 16t 3/32 sprocket that I would be happy to swap for your 15t 1/8" if you like (I'm not in london so you would have to post.)
@BillB started
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I have a 16t 3/32 sprocket that I would be happy to swap for your 15t 1/8" if you like (I'm not in london so you would have to post.)