DTD says no 15" on a JKU? - JKowners.com : Jeep Wrangler JK Forum
 
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post #1 of 7 Old 12-08-2017, 09:38 AM Thread Starter
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DTD says no 15" on a JKU?

So I just hung up with Discount Tire Direct.

They told me that all 15" tires have a load index too low for my JKU Sport... (He read off the actual specs so I got the impression it might be a real thing.)

I know there's plenty in the forum running 15's on their JK. Is there really a load index issue?
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post #2 of 7 Old 12-08-2017, 10:08 AM
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load range is higher for a 33 x12.5-15 compared to 33x12.5-17 general grabber AT 2.

not sure what most of it means though.

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post #3 of 7 Old 12-08-2017, 11:02 AM
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I ordered my last set of wheels and tires from Discount Tire
They were 15x8 Steel soft 8 wheels and 35x12.5x15r Goodyear MTR's. The only issue was I had clearance issues with the brake caliper and steering which was fixed by running a 1" spacer up front as the wheels had 4" backspacing.
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post #4 of 7 Old 12-08-2017, 12:33 PM Thread Starter
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Quote:
Originally Posted by 1eviljk View Post
I ordered my last set of wheels and tires from Discount Tire
They were 15x8 Steel soft 8 wheels and 35x12.5x15r Goodyear MTR's. The only issue was I had clearance issues with the brake caliper and steering which was fixed by running a 1" spacer up front as the wheels had 4" backspacing.
You used 4" backspacing + a 1" spacer to clear the caliper. How close was 4" to clearing them? I'm looking at 3.75 backspacing and wondering if I'll need a spacer as well.
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post #5 of 7 Old 12-09-2017, 08:10 AM
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Quote:
Originally Posted by bryce View Post
So I just hung up with Discount Tire Direct.

They told me that all 15" tires have a load index too low for my JKU Sport... (He read off the actual specs so I got the impression it might be a real thing.)

I know there's plenty in the forum running 15's on their JK. Is there really a load index issue?
Hi, bryce-

There are many 15-inch tire sizes that work for most JK applications. In some instances, though, 33x12.50R-15 tires may not work due to load carrying capacity depending on the trim level. The Sport-S with 255/75R-17 Goodyear SRA tires for example... in this particular case, the O.E. tire carries a 113 load index which at placard pressure (35psi) carry 2,234 lbs. each (accounts for P to LT conversion). All the light truck/ high flotation tires in the 33x12.50R-15 size carry a 108 load index which carries a maximum load of 2,205 lbs.

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post #6 of 7 Old 12-11-2017, 07:16 AM Thread Starter
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Quote:
Originally Posted by Discount Tire View Post
Hi, bryce-

There are many 15-inch tire sizes that work for most JK applications. In some instances, though, 33x12.50R-15 tires may not work due to load carrying capacity depending on the trim level. The Sport-S with 255/75R-17 Goodyear SRA tires for example... in this particular case, the O.E. tire carries a 113 load index which at placard pressure (35psi) carry 2,234 lbs. each (accounts for P to LT conversion). All the light truck/ high flotation tires in the 33x12.50R-15 size carry a 108 load index which carries a maximum load of 2,205 lbs.
Appreciate you reaching out!

So if I've read this correctly my Jeep is basically too heavy for any of the 33x12.50R-15 tires.

What options would I have with a 15" wheel?
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post #7 of 7 Old 12-11-2017, 07:22 AM
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Quote:
Originally Posted by bryce View Post
Appreciate you reaching out!

So if I've read this correctly my Jeep is basically too heavy for any of the 33x12.50R-15 tires.

What options would I have with a 15" wheel?
If you're Jeep came factory with the 17-inch SRA tires, we do not recommend any tire model in the 33x12.50R-15 size because it falls short in load carrying capacity when compared to what the SRA tires carry at factory pressure.

That being said, if you want to run 15-inch wheels, you can go with 33x10.50R-15 tires or bump up to 35x12.50R-15 tires (modifications required). Tire size 32x11.50R-15 works as well, just bear in mind that this size is equivalent, diameter wise, to the factory 255/75R-17.

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Last edited by Discount Tire; 12-11-2017 at 07:24 AM.
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