37x12.5 or 37x13.5 - JKowners.com : Jeep Wrangler JK Forum
 
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post #1 of 14 Old 02-15-2015, 05:49 PM Thread Starter
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37x12.5 or 37x13.5

I'm upgrading my 35's time to move to 37's

Have the RK 1.5"(actual2.5) I'm looking at cooper STT in either 37x12.5 or 37x13.5 Currently have KMC addicts with 4.5" back spacing.

Will the 13.5" wide work?

2013 Sport

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Coilovers F+R
Built and locked 44s F+R
40x13.5 Maxxis RAZR
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post #2 of 14 Old 02-19-2015, 12:31 AM
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I don't think the Coopers are quite as wide as the Toyo's discussed here:

https://www.jkowners.com/forum/archiv...p/t-84116.html
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post #3 of 14 Old 02-19-2015, 05:42 AM
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How wide is your wheel? 8" would be too narrow most likley.

also, the 4.5" bs won't cut it for the 13.5. I have a 1.5" spacer on my 4.5" bs wheels to get full clearance out of my 37x12.50's.

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post #4 of 14 Old 02-19-2015, 06:17 AM
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Interested in this as well, I went with 4" of backspacing on my trail ready beadlock. Looking to wrap them in 37x13.50 Toyos but don't have the coin for the tires just yet

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post #5 of 14 Old 02-19-2015, 06:19 AM
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They will rub during articulation on the lower control arms and likely the frame. The 12.5" wide would be better for that wheel back spacing.

Some build info here:
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post #6 of 14 Old 02-19-2015, 06:22 AM
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Unfortunately Toyo doesn't make a 12.5 in the 37 flavor for a 17in wheel

2010 4-DOOR MOUNTAIN
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post #7 of 14 Old 02-19-2015, 08:30 AM
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I can't speak for the Coopers, but the Toyos are very true to size in regard to width and sometimes underestimated. Their 13.50s are more like 14s.

I would stick with a 37/1250 on that 1.5" RK system OP.

Marcus


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post #8 of 14 Old 02-19-2015, 10:24 AM
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Quote:
Originally Posted by GRIZZLY47 View Post
Unfortunately Toyo doesn't make a 12.5 in the 37 flavor for a 17in wheel
There are other tires that come 37x12.5...the sun doesn't rise and set on Toyo

TC
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post #9 of 14 Old 02-19-2015, 11:01 AM
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I'm aware of that fact, my set of 35 Toyos have beyond impressed me with the situations I have put them in. They're very puncture resistant and the tread life has longevity. Just hate to change a winning formula

2010 4-DOOR MOUNTAIN
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post #10 of 14 Old 02-19-2015, 04:28 PM Thread Starter
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Quote:
Originally Posted by TCdawg View Post
How wide is your wheel? 8" would be too narrow most likley.

also, the 4.5" bs won't cut it for the 13.5. I have a 1.5" spacer on my 4.5" bs wheels to get full clearance out of my 37x12.50's.
My wheels are 17x9
Was hoping the 13.5 would be good for some reason they are cheaper then the 12.5

2013 Sport

Stretched F+R
Coilovers F+R
Built and locked 44s F+R
40x13.5 Maxxis RAZR
Full skids
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post #11 of 14 Old 02-19-2015, 04:29 PM
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Quote:
Originally Posted by jtlr View Post
My wheels are 17x9

Was hoping the 13.5 would be good for some reason they are cheaper then the 12.5

Run a 1.5" spacer and you'll be good. The 9" wheel works w the 13.5

TC
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post #12 of 14 Old 02-22-2015, 02:51 AM
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I agree with the rim with but you might not need the full 1.5" spacer with the STTs. A 1" might do the trick and you can keep your scrub radius in line.

https://www.jkowners.com/forum/showthread.php?t=73472
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post #13 of 14 Old 02-25-2015, 05:49 PM
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I think it makes good sense to pick the tire you want based on traction, toughness, tread wear, or some other measure of performance, rather than whether it is a 12.50 or 13.50 width. Chose the tire you want, and then make it fit. An extra inch of width should be pretty easy to work with .

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post #14 of 14 Old 02-26-2015, 07:56 AM Thread Starter
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Thanks for all the responses. Ordering the 13.5

Thanks again

2013 Sport

Stretched F+R
Coilovers F+R
Built and locked 44s F+R
40x13.5 Maxxis RAZR
Full skids
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