The outer diameter of the tyre 49.6 x 28 VR is 49.6 mm. In general, the first number is the diameter in millimeters, and the second number is the width of the tyre in millimeters. The wheel (or hub) has 3 different diameters depending on where you (...) (25 years ago, 21-Jan-00, to lugnet.technic)
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