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JohnBen
Dodge Dakota
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12/26/2001
17:52:10
 Subject: Tire sizing question
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Message:
The 'standard' tire size on my 99 Dakota was 235/75-15, as I understand it. However, my Dakota had the optional 255/65 Eagle GS tires on it when I bought it.

When I put those numbers into my tire-sizing spreadsheet, I come up with a 3% difference in circumfrence:
235/75 = 90.72 inches
255/65 = 88.13 inches

My question is this: do y'all think my ECM 'knows' that my tires are the smaller diameter, and therefore takes that into account when it calculates speed and distance? Or is a 3% difference just considered within the allowable 'slop' range, and all Dakota computers are set to assume a tire diameter of 90.72 inches (making my current speedometer 3% slow)?

I'm asking because I am going to different size wheels/tires, and I want to know which diameter to try to match with my new wheels.

Thanks to all who respond,
John Bendiksen



AndyL
Dodge Dakota


12/27/2001
15:22:24
 RE: Tire sizing question
IP: Logged

Message:
Go with the 255 65 15 size but remember when you get new wheels and tires try to keep the height the same or 1/2 inch difference also you will have to go down in size with the middle number the bigger a rim you go like 15's 65 16's 60 17's 55 and so on




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