best 31" on wet road?

[strvger]

actually, they are both part of the same conglomerate. i don't remember which has more control over the other.

 

[kris97ranger]

either way as far as i understand it you should always go with the psi on the sticker because of somthing to do with the weight of the truck. but i run my 33s at 30 psi they ride fine and cause there a 12.50 tire on an 8inch rim it helps avoid centre wear
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[strvger]

i weigh my truck at the scales, read the sidewall on the tires for psi @ max wt, and do the math. i'm running E rated 215/85x16 tires on my little truck with topper, tools, and soon aux tank with another 27 gal of gas. when the tank install is done and i fill it and weigh it again, i'll do some more adjusting on the psi. if i went solely by the door sticker that was for the original 195/75x15 tires, i'd be deep in trouble!

 

[chazzone]

Generally, I'd say stick with the recommendations on the door sticker, but recently Ford has gotten in to trouble with this. The Explorer fiasco was the result of underinflating tires, as was the BroncoII rollover issue.

However, I'd say that 40 psi, is way over inflated on an unloaded truck. I run 33 psi in mine (Michellin LTX), and they are great on any road surface, and wear like iron.

The best way to find the optimum inflation for your vehicle is to grab a grease pencil and go to a nice clean, level parking lot.

Mark a line across the tread, roll forward a ways, and look at where the marks have worn off.

If it is over inflated, the center will be clean.

If it is underinflated, the edges will be clean.

Adjust the pressure until it wears off evenly across the tread.

 

[JohnnyO]

actually, they are both part of the same conglomerate. i don't remember which has more control over the other.

Bridgestone owns Firestone. The tires that blew out were ONLY Firestone Wilderness A/T's made ONLY in the 235/75-15 size made ONLY in one specific Firestone factory. When you can narrow it down that specifically...the problem is the tires. AFAIK, the only vehicles with blowout issues were Explorers (Exploders) but eventually all the tires from that factory were recalled. I had a '99 Ranger at the time with those tires and they were recalled at a later date. I went to the Ford dealer and they put Goodyears on it.

My '99 Ranger called for 35 rear and 30 front although me and most everyone else reversed that when the truck was empty to get better tire wear.

When you're using non-stock size rims and tires the only way to tell what to run is just watch how the tires wear and try the chalk mark or grease pencil method. Rule of thumb...all other things being equal, the bigger the tire the less air you need in it.

 

[js314bs]

So... Should I run my 31's as close to the factory rating for the stock 225/70/15 (30psi) as I feel comfortable? That looks way to low and causes the sidewall to bulge out at the bottom next to the contact area, but if that's what needs to be done so be it.
Do the high flotation tires have the same problem with the center section arcing up so it does not contact the road when underinflated? Or does the design of the tire allow for a uniform contact patch at lower inflation because of the intended use?
Am I also reading I need to inflate my tires up for highway close to sidewall rating for safety reasons?
Thanks for all the replys, shows how much I don't know about tires.

 

[94xlt4.0]

a properly inflated tire will have a very slight bulge where the tire meets the road. a good safe estimate is 32 psi for most vehicles unloaded. most vehicles are within 1-2 psi of that either higher or lower so 32 is pretty much about average

 

[Original_Ranger84]

I run 35 on my tires, and thats what we set everyones tires at regardless at the tire shop I worked at unless they were big trucks and we went 55.

30 seems low to me so I would go 32 - 35.

 

[chazzone]

The only time you need to increase tire pressure is if you're adding weight, hauling a trailer, or add more than a couple of hundred pounds of cargo.

Use the marking technique. It is simple and accurate, and will tell you the proper tire pressure for your truck/trim.

 

[lethal-threat-b288]

i'll agree with bruker, run between 30-35psi.

also check the rubber compound, softer tires are better in rain while harder compound tires get very slick......

 

[Lee_533]

What kind of tires? If the tread is too agressive then they will not grab te road. I have 31 procomp mudterrains and they suck on wet roads...I spin them just taking off from stops in the rain...you learn to get use to them. Just have to slow down and watch yourself...

 

[lethal-threat-b288]

i never had a problem with my pro-comps. or the 31" buckshots i have now. but the buckshots suck in nasty mud. but ok on wet roads

 

[JohnnyO]

So... Should I run my 31's as close to the factory rating for the stock 225/70/15 (30psi) as I feel comfortable?

The factory recommended psi on Rangers factory equipped with 31's is 30 lb. I would start out with that and see how they wear. You may end up putting a little more air in the fronts but I can't see needing more than that in the rears unless you're carrying a load.

 

[chazzone]

The factory recommended psi on Rangers factory equipped with 31's is 30 lb. I would start out with that and see how they wear. You may end up putting a little more air in the fronts but I can't see needing more than that in the rears unless you're carrying a load.

When did Ford put 31's on Rangers?

 

[mattpresley]

ah bullshit. I will only run the sidewall recommendation. The door jam spec is great if you are running stock tires or similar. I find it rediculous to run a 50PSI tire at 30PSI. In the vally of the sun when its 115 degrees your tires may blow out under perfect pressure. I'll be damned if I will underinflate here in Arizona when underinflation and hot asphalt are the number 1 and 2 causes of tread separation