Had to drop air pressure

[CoastRider]

running at 45 psi all around, the fronts are begining to show excessive center wear. I dropped them back down to 35, the rears are fine might even bump them to 50 and see what happens, not that there is much weight back there.
Tires are GY Wrangler 235-75-R15, At first I was impressed but after 15k miles they don't grip so well in the wet anymore and are a bit soft, like they belong on a car or small SUV not a FS truck.

[vtec-e]

I had that on my michelins. When i let them down, the uneven wear didn't go away so i guess the steel wires were forced into a certain shape when overinflated from new. I have since read here somewhere that, if overinflated from new, tires may wear in the centre due to incorrect bedding in of the steel wires in the tire. This appears to not happen if they are run at normal pressures for a while (not long i hope) and then overinflated.

When i get my next tires i'll leave them at 35psi for the first week or so. Then i'll go the whole hog on them!
I know we mostly say there is no uneven wear but there may be cases where this is not the case. Anyway, they'd wear unevenly at the reccommended pressures too and that's not considered a problem is it??!!

ollie

[Christ]

Originally Posted by vtec-e

I had that on my michelins. When i let them down, the uneven wear didn't go away so i guess the steel wires were forced into a certain shape when overinflated from new. I have since read here somewhere that, if overinflated from new, tires may wear in the centre due to incorrect bedding in of the steel wires in the tire. This appears to not happen if they are run at normal pressures for a while (not long i hope) and then overinflated.

When i get my next tires i'll leave them at 35psi for the first week or so. Then i'll go the whole hog on them!
I know we mostly say there is no uneven wear but there may be cases where this is not the case. Anyway, they'd wear unevenly at the reccommended pressures too and that's not considered a problem is it??!!

ollie

I believe the last information I got from an AX club member was to street drive the new tires for 1,000 -2,000 miles before over inflating, so they don't have the issues with cord bedding.

That, of course, is based on their experience, and no real scientific testing.

[micondie]

Your wear will not even out unless you run underinflated. The rubber in lthe center is already gone so if you just even out the wear the centers will still have more wear and wear out first.

[CoastRider]

My tires are a bit wider than the typical HM'ers cars tires

I kept them at 35 for the first 8k miles or so. I do rotate them with every 5k miles.

I just need to take corners faster to wear the edges down to match the center But since I started HMing My speeds have gone down a lot. guess I'm stuck.

[Christ]

Just cuz your speeds have gone down doesn't mean you can't take corners faster. I blame my high-speed cornering on hypermiling...

I take corners at 60 that most people won't take at 40, and I do it in a mini-van with over inflated tires. I also have high-speed training and experience on my side, so I wouldn't expect anyone else to do it, but that doesn't stop me. As long as I'm not violating the speed limit, the yellow "cautionary" signs don't mean anything to me on my normal routes.

[MadisonMPG]

I am dropping my air pressure down to 35, after I skidded for about 50 feet today.

[Christ]

I can't convince you otherwise, I'm sure, but can you conclusively say that overinflated tires are the reason you slid?

I don't want it to seem like I'm saying you're wrong for lowering your pressure (apparently, that's what people read into my posts ) but I'm just asking for the sake of knowing whether you checked for a repeatable result, or just assumed that was the reason.

[dwtaylorpdx]

Over inflation is a dicey thing, if you REALLY want to do it buy 16" rims, most 16 inch tires are 8 or ten ply in LT sizes and can take the pressure. The infamous Ford tire debacle was a combination of wrong tire for the job and too much pressure.

Dave

[Frank Lee]

I thought the separations were partly due to underinflated tires?

Who besides us has overinflated tires?