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Wheels and Speedometers

 
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Old 08 Nov 2004, 04:31 pm
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Join Date: Oct 2004
Location: Alva, Florida, USA.
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Default Wheels and Speedometers

I've been reading about people's wheel upgrades to larger diameter sizes. Has anyhone had to get their speedometer recalibrated after making a wheel swap? A change in diamter can throw off the speedometer. I'm wondering how far you can go without affecting the reading?
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Old 08 Nov 2004, 05:06 pm
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Join Date: Mar 2003
Location: Oregon.
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On these cars you can not get your speedo recalibrated. This site will tell you the difference in speed
http://www.miata.net/garage/tirecalc.html
On my GT when I went from factory 205/50-17 to 205/40-17 my speedo is now 6.4% too fast. At 60 mph I am actually doing 56.1 mph. I just compensate with a 4 mph difference. You can adjust going to a bigger size tire by going to a lower profile tire if you want, in other words if I went to a 205/40-18 I would only be reading 2.4% too fast and going 58.5 mph instead of 60 mph. You can play with the numbers and see what you want.
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Old 08 Nov 2004, 06:12 pm
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I went from the OEM size 205-55-16 to a larger 205-50-17. My speedometer is reading .08% too slow so when it reads 60 mph I'm actually doing 60.5 mph. Not enough to worry about.
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Old 08 Nov 2004, 08:35 pm
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Your reports are good news. I'm still thinking of going with the full moon disks from Speedway Motors. If I did I would like to put a tire with taller side walls per "back in the day." It sounds like it wouldn't throw things off too far. Crewzin I like the how the wheels look on your car.
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