TonyB

Thanks for the info Neo.  Looks like I'll stick with the 245's.  Not being a tire "GURU" like it sounds like you are, what is +38?  Is this something that I need to know when purchasing the rims and tires?  Thanks again Tony

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Offset is very important in determining if a set of rims will fit on a car. In addition to the width, this number helps to show how flushed to the fender the rim sits. This is not the definition of offset (but you can find that on the net ;)) but in the real world, the combination of those two numbers will determine how the rim sits in your fender well.

The lower the number, the farther out the wheel moves towards the fender. For example, 20x8.5 +38 will be inside the fender while 20x8.5 +10 will sit outside the fender. (The offset number is a mm neasurement.)

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i learned something new today thanks

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Thanks again Neo, I, as well as some members learned something from that info.

Thanks for the info Neo. Looks like I'll stick with the 245's. Not being a tire "GURU" like it sounds like you are, what is +38? Is this something that I need to know when purchasing the rims and tires? Thanks again Tony

Did you notice you posted in the Website Suggestions and Feedback Forum? ;)  I am sure a mod will move this in no time. :D

Anyway, if you go to 18s, you can run 245/40 tires and no calibration is needed since this tire spec will keep your outside diameter within OEM spec.  Typically, people run 18x8.5 rims. The width and offset will be based on how aggressive you want the car to look.  Also, there is the option of staggered wheels where the wheel is wider (not taller) in the rear.  +38 is a good safe offset to start with.

You can post more details on your preferences and we can go from there. :)

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Thanks for the info Neo. I think that I'm going to go with the same size tires all around. I do want the car to look more aggressive, but do not want to give up a lot of handling. My other car is a twin turbo 300ZX, so handling and road feel are important to me. That's why I don't want to go any higher than 18"s. On the same subject, do you think that going with maybe 255's would be too much as far as the ride and handling department. Right now I have the 225 16's, so anything would be an inprovement. Any further comments would be appreciated. Tony

New member and also a new and happy owner of a 2001 GS430. Bought with 11,500 miles, can you believe, like new. Love the car, hate the small rims. I'm thinking of going to 18" rims. Maybe 245's or 255's. Any idea if this would be a problem with handling, and also any suggestions on the size. Also, once larger rims (tires) are on the car is it a major problem to get the speedo calibrated correctly? Thanks TonyB