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Old 02-06-2009, 10:02 AM   #1
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Speedometer Error

Does anyone know how much of a speedometer error one would get by going to a 185 x 70 profile tire instead of the stock 185 x 65 on the 2002 Focus. Thanks


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Old 02-06-2009, 10:09 AM   #2
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just do some simple math, there is a 20 cm difference in the diameter, so you can figure it out. I don't feel like doing it.
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Old 02-06-2009, 10:16 AM   #3
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There's online programs to do it for you like try this one(may have to copy and paste) http://www.miata.net/garage/tirecalc.html looking at about a 3% error ie. @ 60mph on the speedo you're actually going 61.8mph!Hope this helps!
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Old 02-06-2009, 10:36 AM   #4
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i dont think there is enough to worry about 1-2mph either way the popo wont say anything.
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Old 02-06-2009, 10:54 AM   #5
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Thanks guys. I was also wondering if wheel well clearance could be a problem in snow with the larger tire. Any experience with this?
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Old 02-06-2009, 11:27 AM   #6
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as long as you are on 15 inch rims, you will be fine.
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Old 02-06-2009, 11:29 AM   #7
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Speedos are normally underclocked by 5-10% anyway so I don't think you have anything to worry about.
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