The overall correctly inflated diameter / rolling radius dimensions are the same.
Recommended for temporary spare:
- do not to exceed 50 mph
- restrict to 50 miles use
- avoid heavy braking / acceleration / swerving while it is in situ.
The overall correctly inflated diameter / rolling radius dimensions are the same.
I believe the 18in spare will have a higher profile tyre which makes up for the smaller diameter of the steel rim.
Which is another way of saying what Steve says three posts above.Anothertoy wrote: ↑Sun May 23, 2021 1:26 pmI believe the 18in spare will have a higher profile tyre which makes up for the smaller diameter of the steel rim.