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@Alf531
The pitch, i took off the old cassette (where it tracked all nice) and tried it (with the chain the bike came with) on a borrowed wheel with what i assume is a standard 16T sprocket. But for some reason as I tested it, the chain was good for a couple of teeth before reaching a point where the point between the links made contact with the sprocket teeth - so in effect it looked as though it was running like an osymetric chainring if that helps. Any idea why?