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Bigger wheels, Comp reprogram?

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Old Oct 20, 2005 | 11:41 AM
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Default Bigger wheels, Comp reprogram?

I just picked up some bigger (17's in the front, 18's in the rear) wheels to have fun at the track and on the street with, I dont need to do anything to the computer (i.e. reprogram) when I put them on do I? The stock (16's) total diameter is only about .10 of a inch difference from my new wheels, is this close enough so that I dont have to reprogram the comp? The diff between the front (17) and back (18) is about .07 of an inch, I dont care about my speedo being slightly inaccurate since these wheels arent permanent, I just wanna use them at the track and maybe some weekends so it wont be convenient if the comp has to be reprogrammed each time I swap. Will my tranny shift right? I think this is all the info you guys need to answer my ?. Thanks!
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Old Oct 20, 2005 | 11:54 AM
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Wheels have absolutely nothing to do with it. It is the overall diameter of the tire.
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Old Oct 20, 2005 | 03:21 PM
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Originally Posted by Xsta Z 28
Wheels have absolutely nothing to do with it. It is the overall diameter of the tire.
Thats what I meant sorry.
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Old Oct 20, 2005 | 10:19 PM
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Different overall diameters will have a slight effect on gearing. But within .1" it's not going to matter.
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Old Oct 20, 2005 | 10:47 PM
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Originally Posted by bone324
Different overall diameters will have a slight effect on gearing. But within .1" it's not going to matter.
great! thats what I thought but it never hurts to make sure. Any idea how much is too much, how much of a margin is too much where I would consider reprogramming? just for future reference. Thanks
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Old Oct 21, 2005 | 12:27 AM
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http://www.miata.net/garage/tirecalc.html
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