38.5" tire psi
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Senior User
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38.5" tire psi
whats a good tire pressure to run with 38"s i just got this truck, its a 91 f350 with 6" pro comp lift and 3" body lift with 38.5x15 on 16.5" rims, ground hawg tires, gettin a lil shake at like 40-45mph above that it 80% goes away but still kinda there, checked the tire psi, there all outta wack, fronts are 50psi in 1 and 24psi in another, rear is pretty much the same, 1 45psi 1 like 25psi? what should i run them at?
Elder User
Joined: Feb 2007
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I know this may sound dumb but doesn't it state the recommended tire psi on the sidewall of the tire? I'd go with that. Every tire I've messed with had the psi on the sidwall (grant it I haven't messed with tires that large but I dont see them not putting it on the sidewall still)
FTE Legend
Joined: Jun 2006
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From: Ottawa, Ontario
You don't need to pump them up to the recommended maximum, but you have to at least have the front and rear pairs at equal pressure. I like to run the rear 5-10psi lower than the front when unloaded, it provides better traction and ride.
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Joined: Aug 2006
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Might have better luck getting them balanced at a place that balances tires for Semi's their equipment is larger just expect to pay a little more, your local 4x4 shop may also have the equipment as well. Though personally i'd get the front end looked at.. I've seen vehicles that develop a wobble like what your describing within a narrow range of speed you could be looking at king pins going out on you. (though the vehicles in question were 18 wheelers) just my .02
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well i got the stock tires when i bought the truck, there 33's i think, much smaller tire im gonna put them on and see what happens , these tires are aggressive but i dont think there very good for street, i got them all at 40psi and it still wobbles, i dont even think there radials just 6ply, which i herd will make for even worse driving conditions then the radial version, truck shop said possibly something with the driveshaft angle but he said wit 6" lifts not so much but cause of how it does it at a certain speed then you can speed up out of the wobble its most likely the tire, i also herd theres not much for balancing they can do with something that size, i called a local truck tire shop they said they can put these bags in each wheel and it will help but not make it perfect so... heres the tires anyway, i also have 40" tires of the same tire but brandnew, not sure if i even want to put them on if they dont ride rite on the street, im not familiar with this type of a tire but does this tire look completely wore out, ok, good??
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put the stockers on and shake went away, can those only be balanced by the bag in the tire or are there machines big enough to spin them and put weights like smaller tires??
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well, going off from info awhile back, so the world may have changed in the realm of ground hawgs, but those tires were never known to be the highest of quality, especially for daily driving. but that is why they are lower price than good tires.
driving unbalanced tires not only makes for a crappy ride, it also tears the heck out of the front end with the offset heavy weight basically pounding against everything all the time.
looks like who ever you bought it from went out of his way to get the cheapest possible tire to make the truck sit high. i would double check the lift set up also along with the steering components.
and to answer, no, a tire wearing out won't magically make it off balanced, unless it wasn't balanced right in the first place and created some ackward wear pattern on it. i am not a tire expert but i have had plenty of sets of them.
ground hawgs in my opinion are good only for off road use or a non daily driver. they are cheap and cheap made, which makes for a good secere off-road tire because if you rip the sidewall out, you are not out much money.
driving unbalanced tires not only makes for a crappy ride, it also tears the heck out of the front end with the offset heavy weight basically pounding against everything all the time.
looks like who ever you bought it from went out of his way to get the cheapest possible tire to make the truck sit high. i would double check the lift set up also along with the steering components.
and to answer, no, a tire wearing out won't magically make it off balanced, unless it wasn't balanced right in the first place and created some ackward wear pattern on it. i am not a tire expert but i have had plenty of sets of them.
ground hawgs in my opinion are good only for off road use or a non daily driver. they are cheap and cheap made, which makes for a good secere off-road tire because if you rip the sidewall out, you are not out much money.
Cargo Master
Joined: Jun 2002
Posts: 2,033
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From: Aurora,Colorado
I dont see any wheel balancing weights on the wheel pictured--do I??
And yes--tires will become unbalanced as they wear. I have tires rebalanced at 6 thousand mile intervals and the wheel weights are never placed at the same place on the wheel rim!!
And yes--tires will become unbalanced as they wear. I have tires rebalanced at 6 thousand mile intervals and the wheel weights are never placed at the same place on the wheel rim!!
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