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@dave409787
Do you think it is rubbing because you are using a 1/8th chain. It is designed for use with a 3/32 isn't it? The thinner chain would probably avoid any rubbing. Does it work out that the chainline is correct with the inner/larger sprocket, and a few mm off on the outer or is a standard spocket offset in line with the middle of the dingle... in which case each sprocket is a couple of mm out of alignment in each direction?
Is it better running on the larger or smaller sprocket?