Try 30-32... or better yet check your door placard for the recommended pressures. 60 is what you'd run with the max possible load rating weight on the tire. More weight on the tire requires more pressure in the tire to get the same contact patch on the ground.

 

I run 30 PSI up front and 28 in the rear right now, but I have yet to actually test what will be the best PSI for these. They are 35x12.50x15 MT/Rs. I know 40 is too damn high no matter what...

Siping most definately will help your wet pavement traction...

 

I'm running 44 front and rear. I find absolutely no change in ride from 40 psi to 50 psi. In the rain the rear end gets loose when the tire pressure approaches 50 psi. Below 44 I get less MPG. The MT/R is a pretty soft sidewall/compound so it doesn't use as low a pressure as one would think. 40 psi seems a reasonable starting point. Increase a couple PSI at a time and see what the ride/MPG/traction feels like.

 

No, it is not! Do not judge your tire pressure based on MPG! Over or under inflating your tires for the load on them will cause increased wear and can be very dangerous. Find you door placard and start out with the pressures it recommends, you're shooting for even tread contact across the width of the tire. You will have a little sidewall buldge, that is normal.

The placard looks like this

This is a pickup, notice 26psi front and 35psi rear recommended. Also notice it says "cold", pressure will increase with heat from driving so always check before driving or a couple hours after.

 

Ihaven't gone out to my truck yet but where did you find your placard?

 

Usually on the driver's side door, either on the rear of the door next to the latch or on the B pillar next to the latch plate. If not there look on the other side, glovebox, and under hood on the firewall.

 

oh, that thing...
okay... I was thrown off by the pic.
I think mine's just a plastic sticker

 

It sometimes is just a sticker seperate from the VIN info.

 

cool, thanks dude!

 

My placard, and most everyone elses, reads for the smaller tires. They didn't make a placard for trucks equipped with 31x10.50's.

 

Got my tires siped today!

Discount Tire Co. at $11.99 each.
Haven't noticed anything different though...

 

I don't have a very good luck the RT/S. I had them on my 95 Tacoma and they didn't do too well on ice/packed snow. I never thought of siping them.

I will be getting MT/Rs on my 4Runner when the RT/S wears out, 37k so far. Then I will defenitely sipe them. I live in Washington state and it rains here a lot and I love to go offroad so the MT/Rs will be a good choice. I do not do rock climbing.

 

I will sipe my next tires which will be MT/Rs. I also air down when driving on snow/ice/rain/˟˟˟˟ty weather. I think airing down helps. But then again I also drive like a grandma on snow. I have the GY RT/S now. LOL....

 

If I got one size up. how will I know what PSI to inflate the tires? Since the placard will only say what pressure for the old tire?

 

You can easily run 265/75r16. You'll have to experiment with air pressure but I think a lot of us go a few PSI above stock pressures. Airing down the MT/R's to 10-15 PSI creates awesome traction.

 

I'm very sure I can put 265/75R16s there. I know the 285s will probably fit with some rubbing. I'm just going with the 265/75R16, that will be similar to a 32. I have factory Goodyear RT/S 265/70R16s there now and will mostlikely put siped 265/75R16 Gooyear MT/Rs when I replace the RT/Ss.

My question is, will the tire dealer who install the new tires tell me what the correct tire pressure will be, or will it show on the tire?

I am sure I will enjoy the MT/Rs since I go to the mountains quite a bit.

 

my MT/R's say "35psi max" on the tire

 

My MT/R's say 60 PSI max. There is a big difference in the D load rated metric MT/R's and the conventional sized versions. I rode in my buddy's F150 with 33/12.50s and that thing rides very stiff at 30 PSI compared to my 265/75r16's at 42 PSI. Even he is planning on going with a 16 or 17 inch wheel next time with metric sizing.

 

I have some information to help determine proper inflation pressures for new tires, on- and off-road:

http://www.4crawler.com/Diesel/Tires...roperInflation

 

Les Schawabb sipped my tires for $13 a tire, I thought it was $11, they said it was 11 for new tires. I'm like WTF?