Hi All,

Looking for some advice. I know this is a topic that has been beat heavily, but my circumstances may help or hurt to shed some light on what's best. But I still need help from those smarter than I am.

I've run 35x12.5R20 Toyo MT LT tires on 20x10 wheels for some time. Try to stick with 40 psi, typically dipping into high 30's when the temps really drop. The last set of MT's were worn 1/16" more in the center lugs than the outer lugs.

I've read many times don't dip below 40 psi with an LT tire. However, doing the chalk test, seeing my results of wear last time around, I'm thinking 40 is too high?

So, do I sacrifice tread to stick to the "no lower than 40 psi for an LT tire" rule? Or do I get the right contact patch regardless of how low I need to go (wouldn't go lower than 35 psi though)? Frankly, I'm not even sure 35 would be low enough. Maybe in the front with the weight of the engine, but rear would likely have to go even lower for full width contact.

p.s. Here's a pic of my new Toyo AT II winter setip in the same size after driving over salty roads with 40 psi. Showing I'm overinflated like I was with the MT's, looked the same front and rear...

Thanks in advance!
-Nick

 

Quick update. I've checked contact patch from 45psi down to 35psi. Not a huge difference. With an LT tire I'm thinking full width contact is impossible. Maybe I need a 12" wide wheel with a 12.5" wide tire to achieve it. Going to run with 45psi for a little less resistance and will keep an eye on wear.

 

What load range are they, and how wide are your wheels?

 

Hey gls, thanks for responding! Load range E tires, wheels are 10" wide (toyo recommends 8.5 - 11" wide, with 10" recommended). If I had a narrower wheel I'd understand some bulge in the middle, but figured I was perfect at 10".

 

10" is fine - and I would not run a LR E tire any lower than 40 psi. Rotate them frequently to equalize wear.