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matt e
Dodge Dakota
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3/11/2007
20:22:50
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 Subject: tire size help
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Message:
i have a 4wd 98 w. 31 x 10.5 15's
i want to go to a 01-04 factory 16 and need to know what size tire to run to not throw off my speedometer. i have checked discount tire and what not but there are so many optional tire sizes that im not sure which one is the one i need
thanks in advance guys
matt
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crow318
Dodge Dakota
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3/12/2007
08:16:44
| RE: tire size help
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Message:
If you can find a 31 x 10.5 - 16, that will be the same size. (I have yet to find that)
The 265/70 R16 will give you a 30.6" tire which is close enough to the 31x10.5
Also keep in mind that not all 31" tires are a true 31" diameter.
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Kowalski
GenIII
3/13/2007
07:37:03
| RE: tire size help
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Message:
That's a "nominal" size - they are pretty much all shorter than a true 31". You can use a tire size comparison chart from someplace like tire rack to compare actual heights of different sizes.
Lead, follow, or get out of the way
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info
Dodge Dakota
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3/13/2007
15:04:09
| RE: tire size help
IP: Logged
Message:
Stock Tire - 31x10.50R15 >
Tire 1 - 265/70R16 >
Section Width: 10.51 in 267 mm
Section Width: 10.43 in 265 mm
Rim Diameter: 15 in 381 mm
Rim Diameter: 16 in 406.4 mm
Rim Width Range: 7 - 9 in
Rim Width Range: 7 - 9 in
Overall Diameter: 30.97 in 786.63 mm
Overall Diameter: 30.60 in 777.24 mm
Sidewall Height: 7.98 in 202.69 mm
Sidewall Height: 7.30 in 185.42 mm
Radius: 15.48 in 393.19 mm
Radius: 15.30 in 388.62 mm
Circumference: 97.29 in 2471.1 mm
Circumference: 96.13 in 2441.7 mm
Revs per Mile: 671.6
Revs per Mile: 679.7
Actual Speed: 60 mph 100 km/h
Speedometer1: 60.7 mph 101. km/h
Speedometer Difference: - Speedometer Difference: 1.206% too fast
Diameter Difference: - Diameter Difference: 1.2%
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Phil
Dodge Dakota
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3/14/2007
08:07:18
| RE: tire size help
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Message:
Or you can get a superchips programmer and recalibrate your speedometer according to your tire size. Just another option for you.
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craig
Dodge Dakota
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3/14/2007
08:50:22
| RE: tire size help
IP: Logged
Message:
A dodge dealer will also recalibrate the trucks computer chip
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crow318
Dodge Dakota
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3/14/2007
14:08:59
| RE: tire size help
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Message:
I have done some research on stock tire sizes and speedometer gears. I am pretty sure 98 had a wheel speed sensor. Please correct me if I'm wrong.
On the '97 and older, dodge used a gear driven off the tailshaft to give the spedo its reading. Based on the stock gear listings and ranges of tire sizes, there is a 5.3% range in the speedometer signal. So unless there is correction factors that dodge programmed into the computer based on the stock setup, there is a good chance that your speedometer isn’t accurate from the factory.
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