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How off is my speedo with 20" wheels???

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Old Mar 22, 2009 | 03:54 PM
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How off is my speedo with 20" wheels???
Like the title says when I am cruising on the interstate at around 70 how off is the speedo? Is there a way to recalibrate the speedo for my wheels? Thanks
 
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Old Mar 22, 2009 | 04:10 PM
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What's the side wall size of your tires? You can take to a shop that calibrates cars
 
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Old Mar 22, 2009 | 04:14 PM
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They are 275/30/20 97w and 245/35/20 95w
 
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Old Mar 23, 2009 | 12:36 AM
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no one knows how off their speedometer is?
 
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Old Mar 23, 2009 | 12:40 AM
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between 1-2 mph

My external nav sez i'm going 70 and the speedo is right in between 70-72
 
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Old Mar 23, 2009 | 12:40 AM
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http://www.miata.net/garage/tirecalc.html
 
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Old Mar 23, 2009 | 12:43 AM
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actually here is an exact measurement

When speedometer reads 60mph (96.6km/h) actual speed will be 59.7mph (96.1km/h): 0.5% slower.
 
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Old Mar 23, 2009 | 12:45 AM
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This link will do rim width and offsets

http://www.wheelsmaster.com/rt_specs.jsp
 
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Old Mar 24, 2009 | 02:50 PM
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you are tunning the corect size. That is the best sidewall hight to be as close to factory spec as possible.
 
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