mean on a wheel , for example

15x8 +25 front
15x8 +10 rear

the +25 and +10? how thick the tires are? from rim to the top of the wheel? and if so which one is thicker tire? or bigger one to be more exact? i hope some of this makes sense. :lol: :roll: :wink:

It's offset. Read about offset and what it means here (http://www.tirerack.com/wheels/tech/offset.htm).