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Upgrading my tires

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Old 05-28-2008, 09:17 PM
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Upgrading my tires

Hey guys,

So I'm getting 18" 350z rims hopefully tomorrow. Right now, I have stock 15" rims. My question is upgrading to the 18"s will it affect my speedo? I have a '98 GXE, on stock suspension. Thanks.
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Old 05-28-2008, 10:12 PM
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You just have to find the right tire size to keep your speedo the same.
http://www.miata.net/garage/tirecalc.html
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Old 05-29-2008, 02:23 PM
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Cool thanks. It helped me a lot. My speedometer reading is going to be a bit slow...
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Old 05-29-2008, 08:33 PM
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Oh yeah, another question:

Will it affect my odometer as well?
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Old 05-29-2008, 10:47 PM
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I would say yes
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Old 05-30-2008, 06:57 AM
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It would be lower than it's supposed to right? Is there any way to fix it? :\
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Old 05-30-2008, 07:56 AM
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If you run 235-40s on the front you'll be fine. There really isn't any need to compensate for the .5% difference in the speedo reading.
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