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Wheel offset question

Old 17-Dec-2005, 11:47 PM
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Wheel offset question

I've done a little searching and I know what wheel offset is. My question is how do you determine the correct offset for a new set of wheels.

My current OEM wheels/tires are 16x7, 45 offset with 205/55/16 tires.

Now if I upgrade my wheels and tires to a 17x7 with 225/45/17 as recommended by Tire Rack, will my offset go up (eg. 48) or go down (eg. 42)? My understnad is that if you use larger, wider wheels and tires, the offset needs to be corrected so they don't rub.

Thoughts?
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Old 18-Dec-2005, 03:35 AM
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I'm quite certain it goes down, someone back me up on this lol
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Old 18-Dec-2005, 03:15 PM
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tire size does not effect offset. offset is determined solely by the rim. if you run a wider tire you may need a smaller number offset to push the combo outward, it all depends. i have run 15x7's with a 38mm offset without a problem. i'm running 16x7's now with a 42mm offset which tucks the rim and tire in further which was not a problem, but i added 5mm wheel spacers and still no problem. you can run into a variety of problems depending on what you have setup (is the car lowered?). i had issues with some racing tires rubbing the fender on my rear end under hard cornering (15x7 with 225 hoosiers) so i rolled the fenders and problem solved.
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Old 18-Dec-2005, 09:43 PM
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My stock wheels are a 43mm offset 16x6.5, and my Rotas are also a 43mm offset 16x7. No wheels spacers needed and no rubbing. I guess it all depends on how much bigger and wider you go. From what I've been told even 17x7.5 would work for me between 40-45mm offset. 7.5 wide would mean I could run 235 tires. Max my 7's will take is 225. When I was lowered (to Tein spec) in the rear I had the fender cutting into my tire on the outside, but I only wanted to run 1" lower so not a problem with that.
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Old 18-Dec-2005, 10:11 PM
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Numpers go down, meaning wheels move out. Even if the wheel width stays the same, your tires could get wider therefore you need to move it out slightly.
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Old 19-Dec-2005, 08:18 AM
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So basically a slightly wider wheel would need a slightly lower offset like 42 maybe.
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