Check the specs - they have the same section width, 13" and 13.3". The actual tread width is different, 10.2" and 10.98".

I chose the 12.50 simply because it is a D load, while the 13.50 is E load.


The visual probably won't help any, but I put some pics of an unmounted 37/13.50/18 in the other stt pro thread.
https://www.jk-forum.com/forums/modi...tt-pro-327242/

 

I've been riding on the STT Pro's for about a month now. I'm really impressed, nice ride on the street. On packed snow and ice, they are equal or maybe even better than my Duratracs. I think it's the tread compound they use. Some sipping but not that much. They surpass the duratrac in deep snow and should be outstanding in mud. Haven't had them in the rocks yet. I think the difference between the 12.5 and 13.5 widith is the load range. The 12.5 is D and I think the 13.5 is E and heavier.

 

What he said. But give me a day and I'll take a couple photos and post for ya twoxstreem.

 

Great thanks.

 

Okay, more than a day. This night work week isn't conducive to picture taking.

 

They stick out just a bit. 4.5" back spacing for the wheels. And no, I'm not shoveling for the Jeep

 

They look great. How did they balance up? any hop/shimmy with them?

 

So far so good. But I only have about 300 miles on them so far. No shimmies up to 80mph...they ride so much smoother and quieter than the Toyos I had on. Got to fling some snow around today on the way to work. Always fun

 

Agreed. Mine ride smoother (softer?) than the falken wildpeak all-terrains they replaced, which surprised me. And they are quieter than other mt's I've run in the past (though louder than the wildpeak of course). Think I made a good choice.

 

Love mine....just wish they would make something bigger than a 37.