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@Rik_Van_Looy
^Dropout angle is probably the biggest factor - If ends point up it magnifies the effect of slamming.
Tyre dia. only varies a little (+/-5mm). Strangely, mine look neater with 28mmRando than tubs (curious for pursuit biek).
My guess is production volumes of 14R, Duratec et al means it's probably a craft-activity so they're all subtly different in radius/location.