Outer Limits 4x4 Board

Hi there guy's, I have a question about the wearing of X-Terrains, My front 35's have worn scallops (spelling?) into the big lug which makes them slightly lower than the smaller lugs, so when I take off and stop I get a vibration through the truck, quite annoying. I never realised that they were wearing like that I just thought the chunky tyre vibrated like that. On Friday I rotated the rear tyres to the front and the vibration was gone that was when I noticed how the fronts were wearing. I have been to 3 tyre places who have no explanation as to why they are wearing like that, seeing that not all the big lugs are worn the same, the wheel alignment is good and the complete suspension was renewed before the tyres went on.
So has anyone heard of this happening?? or what could be causing it to happen or are the tyres poo?.

Cheers
Hoppy

In the pic below I have tried to demonstate, the big lug is high at one side then curves to low on the other side, it then makes the low side lower than the small lug in front of it, which gives it the very low speed vibration.
Hoppy

Irregular wear happens on all tyres that arent rotated front to rear. especially steers, some of the earthmover tyres we see have scalloping up to 10mm. rotating and correct presures do wonders.

std80 wrote:Irregular wear happens on all tyres that arent rotated front to rear. especially steers, some of the earthmover tyres we see have scalloping up to 10mm. rotating and correct presures do wonders.

How often should they be rotated front to rear??. And what would be the correct pressure for the X-terrains, everyone says a different pressure.
Hoppy

Hoppy11 wrote:

std80 wrote:Irregular wear happens on all tyres that arent rotated front to rear. especially steers, some of the earthmover tyres we see have scalloping up to 10mm. rotating and correct presures do wonders.

How often should they be rotated front to rear??. And what would be the correct pressure for the X-terrains, everyone says a different pressure.
Hoppy

For nice even wear, 5k, but that is probably a bit pedantic. To work out your correct road driving pressure, start at say 35, go for a decent drive and then measure the pressure when the tyres are hot. Keep doing this until the pressure increases in the range 2 - 4psi. Do a search for a post by Mud Empire for further information...

When i did my defensive driving course, they explained a hell of allot about tyre pressure. To low, the sidwall bulges and the middle of the tyre buckles upwards towards the rim, causing the wear on the outer lugs as you are describing. To high and you run on the centre lugs only wearing them down.

generally scalloping is caused by stuffed shockies, tyre pressure will cause uneven wear across the tread and not what u have described, so bugger shockies = more movement in ur suspension = movement to ur wheel alignment.

ps what suspension setup are u running?

bazooked wrote:generally scalloping is caused by stuffed shockies, tyre pressure will cause uneven wear across the tread and not what u have described, so bugger shockies = more movement in ur suspension = movement to ur wheel alignment.

ps what suspension setup are u running?

2 inch lifted leaf springs and shockies from westcoast suspensions all put in at the same time as the wheels and tyres, shockies are new and fine??
Hoppy

my GQ came with x terrains on it and 2 of them are worn exactly the same and they make the whole car shake its like driving on 50c coins very annoying

InSanE wrote:my GQ came with x terrains on it and 2 of them are worn exactly the same and they make the whole car shake its like driving on 50c coins very annoying

so could this be a fault of the tyre???
Hoppy

ive had mine 20k rotate every 5k run a pressure of about 34-36 cold, and i have no problem. remember they are directional tyres, front to back changes only...

mine have done the same n I drive freeway ks

what are they worth for a 35"??

j-top paj wrote:what are they worth for a 35"??

I think about $350 ea

Bruzar wrote: remember they are directional tyres, front to back changes only...

Really???, sorry but that made me chuckle
Hoppy

thats not too bad i spose, just as long as they last decent enough

bazooked wrote:generally scalloping is caused by stuffed shockies, tyre pressure will cause uneven wear across the tread and not what u have described, so bugger shockies = more movement in ur suspension = movement to ur wheel alignment.

ps what suspension setup are u running?

Yeah, or maybe a stuffed tie rod end, I have strange scuffing on the inside and the out side edges on one of the front tires here.

before that it was a case of the camber being way out as well, totally done in 1 tire.

I don't run x-terrains either.

what width are the 35s, and what width rims are you running them on? ive got the 37x13.5 R15 X terrains, im running them on 15x8s at the moment, but at road pressures they tend to crown in the middle which would cause the wear you are describing. mine have seen very few road miles, so arent showing any signs of wear yet. (i mainly trailer mine to comps, or run 35BFG muds for extended road use}

Madmac wrote:what width are the 35s, and what width rims are you running them on? ive got the 37x13.5 R15 X terrains, im running them on 15x8s at the moment, but at road pressures they tend to crown in the middle which would cause the wear you are describing. mine have seen very few road miles, so arent showing any signs of wear yet. (i mainly trailer mine to comps, or run 35BFG muds for extended road use}

They are 35 x 12.5 x 15's on 10inch rims, Hoppy
Since swapping the backs to the fronts I now have a balancing problem with them, 9 times outta 10 I was getting violent wheel balance shake between 65 to 75, the guy's at Bridgestone took the tyres off and put another 4 ounces of balancing powder in, didn't help, so they blew out all the powder and tried to balance them with weights and they would not balance, they put about a kilo of wieghts on and it kept asking for more. So they took all the wieghts off and put a 12 ounce bag in(He said thats what they put in a prime mover), now 1 in 10 times it has a slight shake at the same speed, but still annoying.
Hoppy

wheel alignment

Hoppy11 wrote:

Madmac wrote:what width are the 35s, and what width rims are you running them on? ive got the 37x13.5 R15 X terrains, im running them on 15x8s at the moment, but at road pressures they tend to crown in the middle which would cause the wear you are describing. mine have seen very few road miles, so arent showing any signs of wear yet. (i mainly trailer mine to comps, or run 35BFG muds for extended road use}

They are 35 x 12.5 x 15's on 10inch rims, Hoppy
Since swapping the backs to the fronts I now have a balancing problem with them, 9 times outta 10 I was getting violent wheel balance shake between 65 to 75, the guy's at Bridgestone took the tyres off and put another 4 ounces of balancing powder in, didn't help, so they blew out all the powder and tried to balance them with weights and they would not balance, they put about a kilo of wieghts on and it kept asking for more. So they took all the wieghts off and put a 12 ounce bag in(He said thats what they put in a prime mover), now 1 in 10 times it has a slight shake at the same speed, but still annoying.
Hoppy

ok well thats not the problem. wheel alignment?flogged out bushes maybe

They said the wheel alignment was good and all the bushes were replaced with the suspension, so they are all good too???
Hoppy

had the same thing with my wranglers mtrs, fronts wore rediculously bad, about 3-5 mm difference in some areas, chucked them on the rear, bout 5000ks later they seem to have evened up. i guess the key is to just rotate then regularly.

Its deffinatelly not the tyres its caused by incorrect castor caused by suspension lifts. Hilux's are especially bad for it as are MQ's. If you are running leaves get a wheel alignment to find out what the castor is and get the appropriate wedges made up to pivot your diff up or down to suit.

DR Frankenstine wrote:Its deffinatelly not the tyres its caused by incorrect castor caused by suspension lifts. Hilux's are especially bad for it as are MQ's. If you are running leaves get a wheel alignment to find out what the castor is and get the appropriate wedges made up to pivot your diff up or down to suit.

Before the Hummer replica was taken to Perth for final rego it was knocked back cause the steering would not self centre ( incorrect caster) It had a wheel alignment and caster wedges went in, the steering self centred, it then passed rego. So the caster was done before the tyres had a chance to wear.

Seems I keep coming up with the answers to your causes ( I wish I didn't then at least I could try something eh).

So please come up with some more cause's as I am stumped.
Cheers
Hoppy

Hoppy11 wrote:

DR Frankenstine wrote:Its deffinatelly not the tyres its caused by incorrect castor caused by suspension lifts. Hilux's are especially bad for it as are MQ's. If you are running leaves get a wheel alignment to find out what the castor is and get the appropriate wedges made up to pivot your diff up or down to suit.

Before the Hummer replica was taken to Perth for final rego it was knocked back cause the steering would not self centre ( incorrect caster) It had a wheel alignment and caster wedges went in, the steering self centred, it then passed rego. So the caster was done before the tyres had a chance to wear.
Cheers
Hoppy

We have a winner, seems I had too much caster, I took the caster wedges out today, hey presto no vibration at all and the steering wheel still self centres, The guy's at Opposite lock in Balcatta helped greatly with this, they seem to think i must have had 0 caster and the wedges made it self centre but it was too much and it caused wheel shake and uneven tyre wear, so thank to everyone that helped with suggestions
Cheers
Hoppy

Hoppy11 wrote:

Hoppy11 wrote:

DR Frankenstine wrote:Its deffinatelly not the tyres its caused by incorrect castor caused by suspension lifts. Hilux's are especially bad for it as are MQ's. If you are running leaves get a wheel alignment to find out what the castor is and get the appropriate wedges made up to pivot your diff up or down to suit.

Before the Hummer replica was taken to Perth for final rego it was knocked back cause the steering would not self centre ( incorrect caster) It had a wheel alignment and caster wedges went in, the steering self centred, it then passed rego. So the caster was done before the tyres had a chance to wear.
Cheers
Hoppy

We have a winner, seems I had too much caster, I took the caster wedges out today, hey presto no vibration at all and the steering wheel still self centres, The guy's at Opposite lock in Balcatta helped greatly with this, they seem to think i must have had 0 caster and the wedges made it self centre but it was too much and it caused wheel shake and uneven tyre wear, so thank to everyone that helped with suggestions
Cheers
Hoppy

Alas my wheel shake is back about the same speed, just a little shake in the wheel at about 60 to 70, not all the time though but most of the time???

Hoppy