What size do you guys think? 37/12.50R17 or 37/13.50R17?

 

I say fatter is better like a hog leg

 

if you have hydro assist get the 13.50 otherwise the 12.50

 

Side by side comparison in the back is all 13.5 as well.

 

I would think that a 12.5 gives plenty of traction and would be little better for wheeling in narrow spots.

 

Don't forget about the possibility of rubbing more with the 13.5 at full lock... The wider ones do look awesome, I'm going with 12.5 wide tire and 3.5" wheel backspacing. Just to ensure there is less to no rubbing.

 

There's no doubt that 13.50 looks so much better, but unless you have the right wheels, 12.50 makes a bit more sense. Functionally, there's no place you're gonna travel with a 13.50 that a 12.50 won't take you as well. I'm running 37x12.5x17 Nittos Trail Grapplers and have been happy.