Tire sizes

[crossram]

Per the web site Ultima uses 245/35ZR18 front 335/30/ZR18 rear.

Why does Ultima use a different side wall hieght on the rear tires??

[AlexCim]

Sidewall size is not a physical measurements like the width is; it's a percentage of the width. For a 245/35, the sidewall is 35% the height of the width (245). So they may well have the same rolling diameter but different sidewall sizes.

And if the wheels were different rolling diameters, is that of a concern for you?

[crossram]

Yes for me it is as I am not using the Ultima body

[AlexCim]

These two tools will help then to compare to standard wheel/tyre sizes.

http://www.1010tires.com/Tools/Tire-Size-Calculato...

http://www.1010tires.com/Tools/Wheel-Offset-Calcul...

[Pedders]

crossram said:

I am not using the Ultima body

That sounds interesting - what body are you using?