Rim width

The width of rims can be measured in 2 different ways: the inside or the outside.

This means that one and the same rim can be indicated both in (for example) 2.15 "and 3.08"

WM2: inside 1.85" (47 mm) outside 2.72" (69 mm)

WM3: inside 2.15" (55 mm) outside 3.08" (78.2 mm)