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Thank you very much for your help, have been going crazy. I ended up taking the bike to the shop where it was purchased for more advice. They told me I had fitted the rear sprocket wrong and it should flange inwards towards the wheel not outwards as like the Sturmey Archer. So they have changed...

The chain keeps coming off the rear sprocket, Sram 7 speed hub. I have replaced the chain, the sprocket and the chain tension wheel. I replaced the sprocket with 19T I wondered if it should be 18T? and would this effect it at all? Can anybody tell me how many teeth the rear Sram sprocket should...