this guy wants to sell me rims and tires for cheap but he doesnt know to much about them. he had em on his 97 acura tl and said the ride was bad cuz they werent the right size(offset im guessing?). i wanna put em on my 98 gxe. the rims are giovanna corsicas. he says they are 18' and the tires are 235/40 ZR18 95W. and thats all he knows. he doesnt know the offset or the rim width. what should i do? is there anywhere i can tell him to figure out the offset?