MEASURMENTS
It may be different for our US chums but, here in Europe, the metric system rules. Still, while just about everything else is measured in millimetres, wheel diameters are still expressed in good old fashioned inches. There are two measurements you need to know about – the width and the diameter. Width is measured from inside the rim where the tyre seats (the bead seat) to the same on the opposite side. It’s never measured from furthest point to furthest point – if you measured a 7in wide wheel like this it could be anything up to 8in wide.
It’s the same story with the diameter, this isn’t measured across the whole face of the wheel but the actual diameter of the barrel where the tyre fits.
RIM CONTOURS
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