Speedometer correction
#1
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Speedometer correction
I was wondering now that I put 20's on my car if the speedometer would be off a little bit? If so how much, anyone know anything about this? I will post pics as soon as my other rim comes, I received 3 rims today
and the 4th will be comming tommarow.
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#4
Go to one of the tire dealer websites and get the revs per mile for your old and new tire size.
Once you have those it's you can see how much bigger or smaller the new tires are and can calculate the speedometer change.
Once you have those it's you can see how much bigger or smaller the new tires are and can calculate the speedometer change.
#5
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This tire calculator can be pretty helpful. With 20's, pretty much any tire you put on it will still lower your speedometer and odometer compared to actual speed and distance. Hope this helps
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#6
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Stock Tire - 235/50R17 >Search Tires Tire 1 - 225/35R20 >Search Tires
Section Width: 9.25 in 235 mm
Section Width: 8.85 in 225 mm
Rim Diameter: 17 in 431.8 mm
Rim Diameter: 20 in 508 mm
Rim Width Range: 6.5 - 8.5 in
Rim Width Range: 7.5 - 9 in
Overall Diameter: 26.25 in 666.75 mm
Overall Diameter: 26.20 in 665.48 mm
Sidewall Height: 4.62 in 117.34 mm
Sidewall Height: 3.10 in 78.74 mm
Radius: 13.12 in 333.24 mm
Radius: 13.10 in 332.74 mm
Circumference: 82.46 in 2094.4 mm
Circumference: 82.30 in 2090.4 mm
Revs per Mile: 792.3
Revs per Mile: 793.8
Actual Speed: 60 mph 100 km/h
Speedometer1: 60.1 mph 100. km/h
Speedometer Difference: - Speedometer Difference: 0.189% too fast
Diameter Difference: - Diameter Difference: 0.2%
Thats it huh... Wow i was expecting much more difference. Anyways, thanks for the help guys
Section Width: 9.25 in 235 mm
Section Width: 8.85 in 225 mm
Rim Diameter: 17 in 431.8 mm
Rim Diameter: 20 in 508 mm
Rim Width Range: 6.5 - 8.5 in
Rim Width Range: 7.5 - 9 in
Overall Diameter: 26.25 in 666.75 mm
Overall Diameter: 26.20 in 665.48 mm
Sidewall Height: 4.62 in 117.34 mm
Sidewall Height: 3.10 in 78.74 mm
Radius: 13.12 in 333.24 mm
Radius: 13.10 in 332.74 mm
Circumference: 82.46 in 2094.4 mm
Circumference: 82.30 in 2090.4 mm
Revs per Mile: 792.3
Revs per Mile: 793.8
Actual Speed: 60 mph 100 km/h
Speedometer1: 60.1 mph 100. km/h
Speedometer Difference: - Speedometer Difference: 0.189% too fast
Diameter Difference: - Diameter Difference: 0.2%
Thats it huh... Wow i was expecting much more difference. Anyways, thanks for the help guys
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#8
I now drive an accord....
Originally Posted by fuzzy02CLS
Umm.....stock tires are 215-50-17
Really your new setup is going to show 4% slower than stock.
When your speedo reads 60 your actually going 62.4
#10
I now drive an accord....
Originally Posted by andre
i guess the ultimate test would be to drive next to a stock car at different speeds and compare...
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#12
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It looks like 235/30's work pretty well, if they'll fit your rim.
Stock Tire - 215/50R17 >Search Tires Tire 1 - 235/30R20 >Search Tires
Section Width: 8.46 in 215 mm
Section Width: 9.25 in 235 mm
Rim Diameter: 17 in 431.8 mm
Rim Diameter: 20 in 508 mm
Rim Width Range: 6 - 7.5 in
Rim Width Range: Unrecognized tire size.
Overall Diameter: 25.46 in 646.68 mm
Overall Diameter: 25.55 in 648.97 mm
Sidewall Height: 4.23 in 107.44 mm
Sidewall Height: 2.77 in 70.358 mm
Radius: 12.73 in 323.34 mm
Radius: 12.77 in 324.35 mm
Circumference: 79.98 in 2031.4 mm
Circumference: 80.26 in 2038.6 mm
Revs per Mile: 816.9
Revs per Mile: 814.0
Actual Speed: 60 mph 100 km/h
Speedometer1: 59.7 mph 99.6 km/h
Speedometer Difference: - Speedometer Difference: 0.356% too slow
Diameter Difference: - Diameter Difference: 0.36%
Stock Tire - 215/50R17 >Search Tires Tire 1 - 235/30R20 >Search Tires
Section Width: 8.46 in 215 mm
Section Width: 9.25 in 235 mm
Rim Diameter: 17 in 431.8 mm
Rim Diameter: 20 in 508 mm
Rim Width Range: 6 - 7.5 in
Rim Width Range: Unrecognized tire size.
Overall Diameter: 25.46 in 646.68 mm
Overall Diameter: 25.55 in 648.97 mm
Sidewall Height: 4.23 in 107.44 mm
Sidewall Height: 2.77 in 70.358 mm
Radius: 12.73 in 323.34 mm
Radius: 12.77 in 324.35 mm
Circumference: 79.98 in 2031.4 mm
Circumference: 80.26 in 2038.6 mm
Revs per Mile: 816.9
Revs per Mile: 814.0
Actual Speed: 60 mph 100 km/h
Speedometer1: 59.7 mph 99.6 km/h
Speedometer Difference: - Speedometer Difference: 0.356% too slow
Diameter Difference: - Diameter Difference: 0.36%
#13
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lol thanks for correcting tire size...Sorry i was kinda baked when I posted.. The tires fit nice, slight rubbing when going over big bumps in the back but nothing too bad. Thanks everyone.
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