I thought a 35" tire was a 35" tire regardless of whether it was on a 17" rim or a 20" rim - the only difference being the amount of rubber on the wheel, which is why it never made sense to me that tires to fit 20"s are so much more expensive than the same size to fit 17"s since there is a lot less rubber in the tires for the 20"s. Maybe one of the tire folks can chip in on this one?

 

I know that 35's and 315's are relatively close as far as the measured height of the two...

But they differ as far as brands, from +/-.5 to 1".

I am not a 100% positive as far as the rim sizes versus tire sizes go, though.

 

If you had 35s and a rear blowout, couldnt you just swap a front with the rear and put the spare on the front? Granted it would take more time and effort, but would it hurt the front end?

 

That's what I'm sayin'...

If you got two different size tires on the front, and are not in 4 wheel drive, you should be ok...

You don't want two different size tires on an axle that is driving though...and probably don't want different sizes on non driving axles for too long either.

Just like on a donut...Don't go over 45 MPH or travel more than 50 miles on it.

 

I get that. That's the only way that I could go with the spare that's under the truck right now. The idea is to not have to jack with switching out two tire/wheels for one flat one. Would prefer to just stick a tire under the truck that's the same size as what I'm running all the way around.

Thomas

 

Check out the tire specs here
http://marktg.toyotires.com/file/18136.pdf

 

Well, according to that, you should be good with a 315/whatever on the stock 17" rim, mounted in the factory location.

 

bob-
Yeah, that probably wouldn't have been the easiest way to go about it. I'm surprised that the 35" tire for a 17" wheel is only a few pounds heavier than the same tire on a 20" wheel. I'm sure that my 20" wheels are heavier than the stock wheels, so does anyone know if there is there any issue with running two different weight tire/rims on the rear wheels?

 

Same here, I have the stock Hummer 315's and the spare fits. Barely

 

...unless you`re planning on going 20K miles on your spare , I`d think you`d be O.K. with a small difference in height and/or weight of the spare....think of all the idiots you see in reg. cars driving around , day after day with the spare on.


...and I too have a 315 on an H2 rim (bored out to fit), as a spare.

 

There should be no problems if only the weights are different...due to the fact that most of these trucks have LSD's I would only use the mis-mached tires on the front axle.

Also 315 is the section width of the tire....the second # is the aspect ratio which is the sidewall height displayed as a percentage of the section width.