Ok here's the useful info i found in my search

Generally, if you increase the width of the wheel by 0.5", you want to subtract 0.5"/2 x 25.4mm/inch or about 6mm offset. This perserves the intended wheel geometry.

Offset is how far in or out the wheels stick. It's the lateral difference between (a) the mounting surface (the flat surface of the hub and of the inside of the wheel) and (b) the center of the wheel. Most FWD cars have more of the wheels surrounding the hub, which is called "positive offset" - the bigger the number, the more they're offset inwards toward the center of the car. Some cars (like "low riders") have negative offset - in which case the bigger the number, the more they stick out.

Ok so stock ITR offset is 50mm. As u might or might not know, I wanted to get a set of CP-035s for my car, and someone offered me a mint used set for a good deal, and i believe the offset was 35mm. Now thats a pretty drastic change...if I take the advice of helpful hint #1, 50-12=38mm...Three more than the 35mm...so I guess my question is, will the 35 mm offset cause any problems for me with either my tires or have a detrimental effect on my suspension? I'm going to call the Tirerack but I know theres a lot of you guys on this board that knows their stuff so...any help would be appreciated, thanks

 

I don't know what proper offset would be... BUT, you need to tell us what size rims you're looking at. 15x6.5? 16x7? The width of the rim will play a huge roll on the offset number that will fit our cars correctly.

 

you need at least 42mm,,,,,recommended/proper fit is 45mm-50mm

 

My bad, its 16x7 wheels. I dunno what size tires, but I will priobably be putting on 205/40-16s..yeah 35 sounds really low