Rough suspension

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Yeah, that'll do it.

What max pressure are the tires and wheels rated for? I have a buddy that likes to put one-ton springs under half-ton trucks, with bigass tires jacked up to as much pressure as the sidewall says. (85 psi, I think.)

Can't convince him that cheap aftermarket wheels may not take that much pressure and be happy about it.

And all that on the piece-of-crap 8.5 ring-gear axle that I took off my truck because it was getting sloppy from wear. (His original axle exploded the differential case. Duh.)
I know the tires are max 65
 

SomeTahoe

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I know the tires are max 65
max 65 for their max load rating, might want to look into your axle weight, and determine what percentage that would be (roughly) of the max rating you would theoretically have with two tires on each axle. My LT tires are E rated, if I loaded them up to 85 like the sidewall says it would expect a load over double what the load really is.
EDIT: by 'expect' i mean it would handle appropriately under that load (in theory it would, in reality my tahoe would break before then). Tire pressure means a lot when it comes to handling and ride stiffness.
 
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Reason is the unsprung weight of the larger tires and heavier wheels. Best bet would be to get a new set of shocks or let a little PSI out and check how much of a difference it makes. Don't go too low and make a dangerous situation tho. But the wider tire just makes more surface area to smack the bumps and cracks in the road and give more feedback through the chassis.
Would I need to get the stock shocks or go with some longer shocks
 

Erik the Awful

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I know the tires are max 65
Remember, they're 65 psi when sitting on a 60° day. When you're on the road on a hot day and the tires are 130°F, they're over 70 psi. Unless you've filled your tires with 99.5+% nitrogen, you get about 1 psi change for every 10°F temperature change.

When I take my Mustang autocrossing, I know that my tire temps will max out around 160°F, so if it's a 70°F day I'll air them up 9 psi shy of what I want.
 

GoToGuy

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Like the sidewall states " MAX psi at xxxx load" , the tires are probably rated to carry twice what your truck is able to carry. That's to keep the tire profile correct under maximum load.
Your not at max load every day. Just try em at 32 to 35. See how it feels.
And if your feel you really want to follow manufacturer service information, look on the door jam or door sill area. There will be a decal with tire size, tire pressure and GVWR.
Good luck!
 

454cid

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Like the sidewall states " MAX psi at xxxx load" , the tires are probably rated to carry twice what your truck is able to carry. That's to keep the tire profile correct under maximum load.
Your not at max load every day. Just try em at 32 to 35. See how it feels.
And if your feel you really want to follow manufacturer service information, look on the door jam or door sill area. There will be a decal with tire size, tire pressure and GVWR.
Good luck!

The decal on my truck says 80psi, just like the max of the sidewall. I can't put the fronts too low, or the tires wear funny.
 

351FUN

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The decal on my truck says 80psi, just like the max of the sidewall. I can't put the fronts too low, or the tires wear funny.

Look at it again, it probably has two options. 80psi is for max load capacity, and it's usually only called out for rears.
 
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