Different wheel diameter options from factory?
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Mountain Pass
Joined: Mar 2019
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From: MO
Different wheel diameter options from factory?
This is a basic question. It seems like the answer should be obvious to me, but it isn't.
See the 1990 F series brochure here: lov2xlr8.no
Page 10 of the brochure (http://www.lov2xlr8.no/brochures/ford/90f/bilder/10.jpg) shows tire options. You can see the standard tire is a P215/75Rx/15SL, but P235/75Rx/15XL is optional.
Won't these two tires have different outside diameters? If so, won't they result in different speedometer readings? Did Ford make some kind of adjustment to the computer or to a sensor depending on what tire you opted for? I doubt it.
Anyway, this didn't make sense to me, and I figured the answer is likely obvious to many on this forum and maybe you can enlighten me.
See the 1990 F series brochure here: lov2xlr8.no
Page 10 of the brochure (http://www.lov2xlr8.no/brochures/ford/90f/bilder/10.jpg) shows tire options. You can see the standard tire is a P215/75Rx/15SL, but P235/75Rx/15XL is optional.
Won't these two tires have different outside diameters? If so, won't they result in different speedometer readings? Did Ford make some kind of adjustment to the computer or to a sensor depending on what tire you opted for? I doubt it.
Anyway, this didn't make sense to me, and I figured the answer is likely obvious to many on this forum and maybe you can enlighten me.
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28" vs 29" for about a 2 MPH difference at 60 MPH, depending on gears, OD trans, actual loaded radius of the tires, temperature, and a host of other variables. That is within the margin of error for a stock speedo.
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