Wheels & Tires Grabbing the road and stopping.

Noob Needs Help w/ Offsets :(

Old Jul 23, 2010 | 05:31 PM
  #2  
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get +0 in the rear.. on 10.5 do ettt
 
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Old Jul 24, 2010 | 12:34 AM
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It's easy bro, for every 0.5" width it's about a 6 offset difference (sometimes 7). As you get wider, you increase the offset by 6 for every 0.5" to get the same effect. As you get narrower, you decrease the offset by 6 for every 0.5". Example:

19x10.5 +0 would have the same effect as 19x11 +6 and 19x11.5 +12, etc.

There is a little variation, sometimes the offset goes up by 7 when you increase width by 0.5" but you don't have to be that exact. This is the general rule of thumb that I use and it's easy and simple. Correct me if I'm wrong people but this is how I understand it.
 
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Old Jul 24, 2010 | 03:07 AM
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^^ Damn it, you beat me to it.

That's exactly how I tell the difference. I always use 7, since it just gives you a bit of that extra edge just in case.
 
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Old Jul 24, 2010 | 06:48 AM
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Hmmm, that was not my experience. I went from a 19X8 +30 to a 19X8.5 +38 in the front on my new wheels and they are considerably more sunken in than the previous rims.

Maybe I misunderstood the math.
 
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Old Jul 24, 2010 | 10:57 AM
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Originally Posted by Blue Dream
Hmmm, that was not my experience. I went from a 19X8 +30 to a 19X8.5 +38 in the front on my new wheels and they are considerably more sunken in than the previous rims.

Maybe I misunderstood the math.
you should have only been sunken in by 2mm based on your specs.

but depending on what size tires you were running with each wheel setup, it may have made it look like it was sunken in more than it was.

http://www.1010tires.com/wheeloffsetcalculator.asp
 
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Old Jul 24, 2010 | 12:20 PM
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Offsets are rarely bang on jumping from different manufactures.

The +6/+7ish math has always worked for fitment on the cars I've selected wheels for.
 
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Old Jul 24, 2010 | 09:56 PM
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Originally Posted by Blue Dream
Hmmm, that was not my experience. I went from a 19X8 +30 to a 19X8.5 +38 in the front on my new wheels and they are considerably more sunken in than the previous rims.

Maybe I misunderstood the math.
Like patman said, the difference should be very minimal (1-2mm). Besides tire size, camber is also a factor.
 
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