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O.L.D. = Over-Locknut Dimension
Remove your wheelset > Measure the opening size of the front/rear fork(inner width)
O.L.D. Sizing Guide
100mm for most bikes with either rim brakes or disc brakes
74mm for some folding bikes with rim brakes (Dahon, Oyama etc.)
130mm for most bike with rim brakes
135mm for most bike with disc brakes