Tire Size v. Rim Size - JeepForum.com

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post #1 of 16 Old 12-20-2012, 12:03 PM Thread Starter
fosterjd79
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Tire Size v. Rim Size

My rims are 17x8

I am currently running 265/65/17 tires.

How do I know what size tires will fit? What is the max width? Min width? Can I drop to 245/75/17's on that rim? I guess I am more interested in going with a thinner tire rather than a wider one.

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post #2 of 16 Old 12-20-2012, 12:52 PM
billzcat1
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With Jeep tires, you can go up to 4" wider on the tire than the rim it is mounted to. A 265 width tire is 10.4" and will stretch nicely onto an 8" rim. The 245 is 9.6" wide, will fit fine although if you wanted to run really aired down and wheel it, you might want to consider a 7" wide wheel to get a little better bead seating at low pressure. If you're staying on the street and doing all but the most difficult wheeling (ie: requiring beadlocks) then you will be fine with either tire size on those 8" wheels.

I agree that thinner tires are a good choice. I think overall people get caught up in width which doesn't provide many advantages in all-purpose use for the disadvantages it presents.
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post #3 of 16 Old 12-20-2012, 02:04 PM Thread Starter
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I am doing all but the most difficult wheeling. I have only ever driven with wide tires so I am used to the "float." I'm thinking about 245/75 duratracs. I have read that those will cut into snow and mud better. I'm interested to see/feel the difference. Problem is, I can only find 245/75/17 tires in 10 ply. Overkill, I know. I am putting a set on my wife's mall crawler. If she hates them, they are going on the WJ.
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post #4 of 16 Old 12-20-2012, 08:48 PM
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^^ I ran 10-ply for a while (Hankook Dynapro ATm) and they destroyed my fuel mileage. 10 ply tires are HEAVY.
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post #5 of 16 Old 12-20-2012, 09:41 PM Thread Starter
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They are only 5 lbs heavier than the 6 ply. It made that much of a difference?
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post #6 of 16 Old 12-20-2012, 09:43 PM
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that's not too bad then. My 245/70/17 10-ply ATs (30.5") were 12lbs heavier than my 255/75/17 M/Ts (32") IIRC.
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post #7 of 16 Old 12-20-2012, 09:45 PM Thread Starter
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I think duratracs weigh a ton. Heaviest tire I've ever had anyway.
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post #8 of 16 Old 12-21-2012, 12:00 AM
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Quote:
Originally Posted by fosterjd79 View Post
They are only 5 lbs heavier than the 6 ply. It made that much of a difference?
Putting heavy MT tyres on my gc affected performance and fuel consumption much more than I ever expected..... about 4mpg worse. The motor having to turn all that extra weight on each corner (about 10lb each corner in my case) affected acceleration noticeably too.Adding weight to the unsprung parts of the car (parts not supported by the springs such as wheels, types, brakes etc) also affects the handling much worse than adding weight elsewhere.

If you can't fix it with a hammer, you've got yourself an electrical problem!
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post #9 of 16 Old 12-21-2012, 06:42 AM
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Skinny is the way to go, especially so if your jeep sees little trail time.

'02 WJ: 4.7L, 5", HP44/9", 231HD, tall & skinny KM2's
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post #10 of 16 Old 12-21-2012, 06:45 AM Thread Starter
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My jeep sees tons of trail time so now I'm torn. I have read all about the wide v. narrow debates in a few forums. Seems like there is no perfect solution for all situations.
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post #11 of 16 Old 12-21-2012, 09:29 AM
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Originally Posted by fosterjd79 View Post
My jeep sees tons of trail time so now I'm torn. I have read all about the wide v. narrow debates in a few forums. Seems like there is no perfect solution for all situations.
Even on the trail, I'd go skinny. IMO, benefits outweigh the downside, which is contact patch. However, if an inch less tire width gets me stuck somewhere, or can't maneuver an obstacle, I have other problems.

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post #12 of 16 Old 12-21-2012, 10:32 AM
billzcat1
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I'd only go wider if lots of mud or sand was in my future. Almost everything where I like to go is rocks, roots, and packed dirt with reasonably good drainage.
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post #13 of 16 Old 12-21-2012, 10:43 AM Thread Starter
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I am dealing with a lot of rocks, roots, and packed dirt but also the occasional bad drainage area. I have been successful in floating over those flooded areas with the aired down wide tires. Now, 10 ply tires aren't going to air down very well at all and they will be skinnier. That's my concern. Is it worth the change to skinny if I'm going to lose confidence in the ability to keep going when I meet that flood zone. Or, do I let it go and tell myself that is what the winch is for?
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post #14 of 16 Old 12-21-2012, 08:39 PM
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Originally Posted by fosterjd79 View Post
My rims are 17x8

I am currently running 265/65/17 tires.

How do I know what size tires will fit? What is the max width? Min width? Can I drop to 245/75/17's on that rim? I guess I am more interested in going with a thinner tire rather than a wider one.
My last set of tires,265/75R16's,stated very clearly on the sidewall to mount only on a 7" wide rim.I run 12.50's on a 8" rim and have gone as low as 8psi without worry of blowing a bead.


10 ply tires can be as flexy as 6ply's,just need to airdown a little more and will take a little longer to "break in" on the trail.

'02 Liberty sitting on 35" tires,HP44,RockJock60,and AtlasII t-case
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post #15 of 16 Old 12-21-2012, 09:49 PM Thread Starter
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Originally Posted by tjkj2002 View Post
My last set of tires,265/75R16's,stated very clearly on the sidewall to mount only on a 7" wide rim.I run 12.50's on a 8" rim and have gone as low as 8psi without worry of blowing a bead.
What brand?
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