Hi ard,

Thanks for the warning

Do you mean rolling circumference?

The static diameter of the new rear tyres is <1 cm greater than the fronts, which considering the fronts are part worn I think is quite close. That said, this gives a difference of 18mm (3/4") in the static circumference front to rear.

Do you know if there is an allowable difference/tolerance and if so what it Is?

Thanks Pat