Question:
I want to use 15" winter tires so I do not subject my aluminum wheel to the winter salt. My truck has 245/75/16" as original equipment, What size 15" tire would give the same outside diameter so as to not through the speedometer off??
Answers:
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Your tire is about 30.4" tall(245*.75*2) + 16*25.4 = 30.4" = 773.9
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773.9/25.4=30.4"
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260/75 15" = 30.35"
230/85 15" = 30.39"
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I don't know if these sizes are available or not.
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The first number is the tread width. (245mm)
The second number is the ratio of the sidewall to the width.
75% of 245mm
Multiply by two for the top and bottom.
The wheel is in inches so you need to convert that to mm.
Add it up.
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A 260 tire is wide for winter. So look for a 85 series tire.
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There is about 1.25" width differance between a 230 and a 260 tire. Depending on the width of you wheel a 260 wide may be too big.
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245/80-15 would give the closest reading. When your speedo is reading 60 mph, you're actually going 59.9 mph. Here's how you check...http://www.miata.net/garage/tirecalc.htm...
Is this just for a $70 ticket?
a 31 x 10.5 r15 is the closest size that will work. you will not notice a speedo difference. the general rule for keeping the speedo accurate is to stay within 3% of the original height of the tire. this is very important if you have abs brakes. i've put these tires on many trucks with no problems.More Questions & Answers ...
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