Ukuran ban modhèren (kaya "37-622", uga kaloka minangka ETRTO) diatur nganggo baku internasional ISO 5775, bebarengan karo baku ukuran rodha pit (tuladha "622×19C"). Older English (inch, e.g. "28×1-5/8×1-3/8") and French (metric, e.g. "700x35C") designations are also still used, but can be ambiguous. The diameter of the tire must match the diameter of the rim, but the width of the tire only has to be in the range of widths appropriate for the width of the rim. Diameters vary from a large 910 mm, for touring unicycles, to a small 125 mm, for roller skiing. Widths vary from a narrow 18 mm to a wide 119 mm for the Surly Big Fat Larry.