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Old 08-30-2008, 04:09 PM   #1
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wheel size on FF car

I finally got a cheap set of alloys to replace my rusting steelies (plus, I hate hubcaps).

The wheels have two different sets of tires on them: one is the correct outer diameter for my car, the other is just slightly smaller.

I assume that, to keep my odo & speedo correct, I need to put the correct size tires on the front, with the smaller ones on the rear (the difference is very small, less than 1%, EDIT: Make that 2%), because it is a front wheel drive car. Am I right about that?
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Old 08-30-2008, 04:44 PM   #2
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Some odometer/speedometers are off by 1+% from the factory running on the stock tires.

If I were you I'd rotate the tires as usual and then double check my odometer against a group of 60-70 interstate mile markers- then find out how far off it is and figure out a correction factor based on which tires you have on the front.
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Old 08-30-2008, 05:48 PM   #3
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http://www.miata.net/garage/tirecalc.html one good site-punch in your original tire/rim size and your new size and it will tell your actual speedometer mph.
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Old 08-30-2008, 08:03 PM   #4
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here is another good calculator. if you don't know the tire size you can just put in the year, make and model. it also tells you the percentage that the new size will be off.

http://www.1010tires.com/tiresizecalculator.asp
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Old 08-30-2008, 08:21 PM   #5
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he isn't asking how much difference they are...

yes, put the larger tires on the drive axle (front)
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Old 08-31-2008, 06:42 AM   #6
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Yep, on the front, unless you're doing any towing with it, then I'd put them on the back, 'coz the smaller diameter are probably a slightly lower load rating, and the slightly lower gearing would work better for towing.
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Old 08-31-2008, 11:12 AM   #7
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Thanks for the tips, everyone.
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