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Old 04-23-2009, 11:30 PM   #1
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Tires to add sidewall and correct speedometer?

I need new tires for my '04 SVT.

Stock is 215/45R17

My speedometer reads ~3% high. When my real speed is 60mph, the speedometer reads 62mph.

Is there a tire size close enough to 215/45 which will fit the stock 17" rim but correct the speedometer and have a bit more the 45% sidewall?


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Old 04-24-2009, 12:56 AM   #2
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on my car i have 205/45zr17 and at this time i didn't see any difference in the speed
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Old 04-24-2009, 01:54 AM   #3
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215/45/17 is what came standard on an SVT. Your speedometer shouldn't be off that far. Something else has had to been changed? Have you messed with the gauge cluster at all by like adding a new face or changing it at all? You can always have a shop test it for you and realign it as well which would be cheaper than buying new tires. Or you could do it yourself but the way I did mine was kind of dangerous to do, follow behind someone going at a certain rate of speed etc...stupid way to set it but it worked for me lol
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Old 04-24-2009, 01:59 AM   #4
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215/45/17 is what came standard on an SVT. Your speedometer shouldn't be off that far. Something else has had to been changed? Have you messed with the gauge cluster at all by like adding a new face or changing it at all? You can always have a shop test it for you and realign it as well which would be cheaper than buying new tires. Or you could do it yourself...l
Some amount of error is normal in speedometers. I didn't change anything. I don't "need" to fix the speedometer. I'm just saying I need to buy new tires anyway, and I have some error in the speedometer that could be used to get a tire with a slightly different diameter to both decrease the speedometer error and give me a bit more sidewall depth.
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Old 04-24-2009, 09:10 AM   #5
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If your tires are worn to the wear bars, you'll get back nearly all of the 3% by putting new stock size tires on. The next size taller tire is a 205/50 17, which is nearly 0.5" taller than 215/45 17. You'ld probably be off by more than 3% in the other direction. 60 mph actual would read 57-58 on your speedo. You're going faster than what you think. Causes tickets.
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Old 04-24-2009, 10:26 AM   #6
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If your tires are worn to the wear bars, you'll get back nearly all of the 3% by putting new stock size tires on. The next size taller tire is a 205/50 17, which is nearly 0.5" taller than 215/45 17. You'ld probably be off by more than 3% in the other direction. 60 mph actual would read 57-58 on your speedo. You're going faster than what you think. Causes tickets.
Currently, when my speedometer reads 62mph, I'm actually going a shade below 60mph — according to my GPS and roadside speed measuring equipment.
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Old 04-24-2009, 10:56 AM   #7
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I really wouldn't worry about it. Something as simple as variations in tire pressure can cause similar errors. It might be interesting to know the accuracy factor of the GPS. I'm betting its not perfect. I know the roadside ones can be way off. We have one in our neighborhood that's easily 3 to 5 mph off in the ciy's favor to get people to slow down even more (school zone which I don't have any problem with). If they were used for enforcement purposes then yes, they would have to be far more accurate.
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