inch versus metric

  1. plehman

    R100RS tire sizes

    The tires on the new to me R100RS from 1981 are 8 and 9 years old. Plenty of tread, but too old and hard as a rock. Metzlers The front says: 3.25 on 19inch. I assume that's 100/90 but that designation isn't on the tire. The rears say 120/90 on 18in. But J&P Cycles says that tire doesn't fit...
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