Tire equivalent in metric?
#1
Tire equivalent in metric?
I have been looking around for a good set of wheels for the resto mod of Beast. I'm finding a lot mor diversity in the 17" range, but most at a 9" wide rim as opposed to the 8" of the 16" rims. I was planning on running LT265/70R16. What would be the equivelant aspect ratio for a 17" rim? I think the 265's are plenty wide enough, but if I have to go wider due to a 9" rim, I'd stop as close as possible, so maybe 275.
God I miss standard size tires.
God I miss standard size tires.
#2
Tire size calculator
This calculator is very useful... according to it, a close 17" equivalent would be 255/70 X 17. The speedometer would read 1.5% slower than with the 265/70 X 16, so at an indicated 60 mph, the truck would actually be going 60.9 mph.
This calculator is very useful... according to it, a close 17" equivalent would be 255/70 X 17. The speedometer would read 1.5% slower than with the 265/70 X 16, so at an indicated 60 mph, the truck would actually be going 60.9 mph.
#5
The metric size designation is a little harder to figure out that the old "33/12.50-15", but there is a pattern to it that can be understood.
Taking LT265/70R16 as an example:
LT = light truck, designates heavier duty than P = passenger car
265 = width in mm, divide by 25.4 to get inches, so 265 mm is 10.43"
70 = aspect ratio, or sidewall height expressed as a percentage of width. So the sidewall height on this tire is 70% of 265 mm, or 0.7 x 265 = 185.5 mm or 7.3"
R = radial (sorry for being so obvious)
16 = rim dia in inches
To figure out the outside diameter you add twice the sidewall height to the rim dia, so 2 x 7.3" + 16" = 30.6"
And yes, a tire calculater is quicker and easier.
And as bad as the metric designations are, they're better than the old "L78-15" size system!
Taking LT265/70R16 as an example:
LT = light truck, designates heavier duty than P = passenger car
265 = width in mm, divide by 25.4 to get inches, so 265 mm is 10.43"
70 = aspect ratio, or sidewall height expressed as a percentage of width. So the sidewall height on this tire is 70% of 265 mm, or 0.7 x 265 = 185.5 mm or 7.3"
R = radial (sorry for being so obvious)
16 = rim dia in inches
To figure out the outside diameter you add twice the sidewall height to the rim dia, so 2 x 7.3" + 16" = 30.6"
And yes, a tire calculater is quicker and easier.
And as bad as the metric designations are, they're better than the old "L78-15" size system!
#6
Thanks for the replies everyone. I'm considering the LT265/65R17 option. This does raise another question. If the wheels I really want are only available in 17x9, should the 265's fit ok? And what else would I have to look at. I know this is not as agressive as so a of the 4x4's have, but this is a street build.
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Dreamtheatre
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
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11-21-2014 07:12 AM