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 Old 02-25-2011, 05:11 PM   #1
 
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Default Speedometer question with 20's

How much will my speedometer be off if I get 20's?
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 Old 02-25-2011, 05:37 PM   #2
 
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Default

depends on tire size/overall wheel height

http://www.miata.net/garage/tirecalc.html
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 Old 02-25-2011, 10:14 PM   #3
 
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your answer is right here in the tires wheels section...

CX-7 Tire Size Chart

search is your friend...
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 Old 02-26-2011, 05:01 AM   #4
 
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Use a "tire size calculator"
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 Old 08-20-2015, 04:18 PM   #5
 
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I put 245/45/20 on mine and tested it with a garmin gps and the speedometer is dead on
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 Old 08-20-2015, 04:21 PM   #6
 
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Throwback Thursday?
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 Old 08-20-2015, 04:47 PM   #7
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Originally Posted by jerritt View Post
I put 245/45/20 on mine and tested it with a garmin gps and the speedometer is dead on
That's because the circumference of the tires is only about 1.47% different than stock, and your tire is actually slightly smaller than the OE one.

Also, way to dredge up a thread that died in FEBRUARY OF 2011...
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 Old 08-20-2015, 04:54 PM   #8
 
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Twankie-fo's or gtfo.
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