Since most of my driving is in-city with my 31x10.5 BFG A/T tires, I'd like to maximize my MGP rating as much as possible. What's the conventional wisdom on how much to inflate these things?
Road-going air pressure on BFG A/Ts?
- Thread starter austinmark
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I've been running mine around 30-35 PSI around town and highway. I think the max cold pressure is 40 on those tires and I'll bump up to that if I'm carrying around a particularly heavy load of stuff and/or people.
I get around a combined city/highway of 12 MPG with all the stuff I normally carry and my driving habits. I've tried lower PSI for comfort and higher for load capacity and neither really made any appreciable difference to my MPG so I just compromised with the 30-35 range.
I get around a combined city/highway of 12 MPG with all the stuff I normally carry and my driving habits. I've tried lower PSI for comfort and higher for load capacity and neither really made any appreciable difference to my MPG so I just compromised with the 30-35 range.
The ideal pressure will depend on the weight of the rig and the width of the wheels. Ideally you want even wear across the entire tread area. try chalking a heavy mark across the tread and drive around for a day and see where is is rubbed off. If the edges are gone, you need more pressure. If the center is gone but not the edges, you need less.
I running 35psi.
Double check your max cold pressure...I believe mine state 65 psi. That being said, I have found that running my 30's on stock wheels @ 44 psi cold seems to render the best road manners.
We run 50. Mike
following is how I run my 33x10.5 BFG AT, which is how I ran my 33x9.5 BFG MTs IMHO all of it would apply to the 31" version too, maybe with a little less crowning effect
No less than 36-38psi if I'm road only. Even on good dirt roads, if running all day I air down to 30 or less, which makes a nicer ride, down to 20ish if rough and wash boarded and tougher routes are in the plans.
You might see some "crowning" at high psi, I rotate at every oil change, (4K miles or once a year which ever comes first) And lower the pressure to 32 sometimes to help counter the crowning effect on the wear pattern, Usually I do this when I am airing back up from a desert run, stop at 32 for a couple hundred miles then air it on up to 38ish for around town. My rig is pretty much a garage ornament, so this whole cycle of air-up-then-down may only happen 4 times a year...seldom put 3K a year on it.
And it looks it!
No less than 36-38psi if I'm road only. Even on good dirt roads, if running all day I air down to 30 or less, which makes a nicer ride, down to 20ish if rough and wash boarded and tougher routes are in the plans.
You might see some "crowning" at high psi, I rotate at every oil change, (4K miles or once a year which ever comes first) And lower the pressure to 32 sometimes to help counter the crowning effect on the wear pattern, Usually I do this when I am airing back up from a desert run, stop at 32 for a couple hundred miles then air it on up to 38ish for around town. My rig is pretty much a garage ornament, so this whole cycle of air-up-then-down may only happen 4 times a year...seldom put 3K a year on it.
And it looks it!
