Circumfrences will alter when the tyre is fitted to the rim and allowed to settle, depending on the width of the rim, the heat within the tyre and wear. Tyre Continental 4.00 10. Size = 4.00 10. 4.00 10 is the old fashion way to raise your gearing on Lambrettas, but the down side is you will need to shave most if not all of your bump stop off to fit.
