my dad wont believe me......O_o how do i explain this to him =\

 

What matter is the actual width of the tread at the top of the tire, and how close the outside edge can get to your fender. If you have 17s but a very short sidewall, like 215/35 or 215/40, you'll be ok with a different offset. but changing the offset and diameter of your wheels can have side effects like bumpsteer, harshness, uneven wear, etc.

 

so its probably best to stick w/ 53mm no matter what sizes and stuff then?

 

The answer to this is no. The reason being is because the offset of the OZ P1 wheels in the 18x7.5 runs a 48mm offset because the wheel is wider. So the offset is based on the width of the wheel. OZ compensated the width by lowering the offset.

 

if you change the offset, doesnt it change the geometry of the suspension or something like that? =\

 

Depends. The idea of the offset is to keep the center of the tire's footprint well, centered. If you widen the tire, but don't move it inside or outside to compensate for the width, then yeah, you get geometry changes, hence bumpsteer, uneven wear, etc. But if your chenge in offset cancels the change in width ( i.e. matching +10mm in width with -5 mm in offset) you are ok, up to a point. Fenders or not, you'd have some problems trying to compensate for 40 or 50mm in width for sure.

 

Of course. But with brakes all you have to worry about is whether or not they will fit in your wheels. The good companies are very helpful about that if you ask.