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@ffm
My guess is that this means you've got a poorly dished wheel **and **a bent rear triangle. On the 48x17 side the dish is just enough to compensate for the asymmetry of the rear triangle and it ends up dead straight. The other (48x19) way round the dish and the wonky frame geometry both push it off in the same direction. So, check the dish of the wheel and do the string test?