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Tire Size Help

4460 Views 20 Replies 7 Participants Last post by  Pilotguy
Is a 30/9.50/15 the same as a 265/70/r15?

Thanks in advance.
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30x9.50x15 = 29.99" dia

P265/70R15 = 29.60" dia
Speedometer Difference: 1.326% too fast
265mm = 10.4in wide versus 9.5", so no.

30" height versus ((265 * 0.70 * 2) / 25.4 ) + 15 = 29.61", so no.
Would this be an acceptable tire to replace my BFG Trails with? Michelin LTX M/S at 30/9.50/15. I'm reluctant to not put the same tire on my vehicle that the manual says it should have.
the difference in size that you posted is just about insignificant. don't sweat it.
Put a set of 31x10.50 on it and call it a day. It will look better too. Pop put a set of 265/70/16's, which are a little bigger than stock, on his '01 se 4x4 and they fit fine and look good. By the way, he used Firestone Destination AT's.

265/70/16 is basically the same as a 31X10.50X15
265/70/16 is basically the same as a 31X10.50X15
...other than the rim size being different. I think the OP is only after new meats, not wheels as well.
That was for fitment purposes only, the point was that the truck models are the same. I recommended 15's for him because that's what he already has.
Put a set of 31x10.50 on it and call it a day. It will look better too.
So would it be less safe having 1" less width on the ground (10.4 vs. 9.5)?
it wouldnt be be unsafe i run tires that are about 9.5inches wide. with the rims that you have i would go with 31x10.50x15
What does the 31 do to gas mileage if anything? I'm sure the speedometer will be lower than actual speed.
Taller tires are just like putting in a numerically lower rear gear in. The vehicle will be moving faster for a given engine speed in a given gear, or seen another way, the revs will be lower for a given vehicle speed. Mileage and performance will likely be worse, but not significantly (maybe even unnoticeably).
So, I'm torn between the 31 and 30 inch tires (31/1050/15 and 30/950/15). One is 1/2 inch higher but 1 inch less tread on the ground, the other has the same tread on the ground but sits 1 1/2 inches higher than my 265/70/15s. But if I want the Michelin LTX M/S I must go with the 30 or 31s.
The 31" tire will probably only be about 1" taller. If you go to the manufacturers website and pull up the tire specs, you'll find the actual tire size.
When I switched from factory tires (235/70/15) to 31x10.5x15 I noticed no differance in gas mileage in the city but about 1.5 more mpg on highway going 65mph. My speedometer is off by about 4mph at 60mph. exponentially less going slower, more going faster..
i went from a 29 to a 31 and couldnt tell a difference with mileage or power
Thanks to all of you. I'm getting a set of 31/10.5/15 Michelin LTX M/S tires in the morning. A little more than the BFG LTs but from having had 2 sets of LTXs on other vehicles with about 120K on them total I know how good a tire it really is. Oh, and RWL out!
youll be happy with your decision
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