Outer Limits 4x4 Board

Gday - just dragged my 33 jungle trekkers out of the shed and bolted them up to the cruiser and suddenly as soon as i hit 40 kmh the car feels like the wheels are gonna fall off . i checked all the wheel nuts and everythings tight - shakes so bad i can barely hang onto the steering wheel . i was thinking wheel bearings or tyres out of balance ?
they used to shake a little last time i had them fitted but i have now fitted a 2" body lift and tightened all the diff ubolts as both front and rear drivers side ones where loose .
also when i run my 31" at's there is no shake at all that i can notice which tells me it's the tyres - the tyrepower down here reckons they cant be balanced because of the tread missing a few lugs.

maybe try balance them 1st

Have you seen this post...... http://www.outerlimits4x4.com/viewtopic.php?t=106937 Oh and if they are outa balance this may be the answer. If you have had the tyres sitting around for a while they may have flat spotted and will come better when they warm up after being driven on for a while.
Jonesy

I agree with MYtuff, mine vibrate when first driven on, but only when i have left them on the truck and not driven for a while as they develop a flat spot. How did you store them, stacked up or leaning up against a wall or similar.
Dazz

bj42turbo wrote:I agree with MYtuff, mine vibrate when first driven on, but only when i have left them on the truck and not driven for a while as they develop a flat spot. How did you store them, stacked up or leaning up against a wall or similar.
Dazz

Good idea there, why not ask around a few other tyre places and see what you come up with.

they were stored deflated and stacked up on top of each other . wheel shake is more extreme than just a wobble - actually hard to hang on to the steering wheel and stay on the road - have taken them back off the car and am gonna try to get them balanced at another tyre shop at tyrepower flatly refuse to even try.

I'd say they're badly flatspotted. If you leave them on the car for a little while at high pressure the spot should come out. Mine used to do it if they sat on the car even overnight - not that bad though. After a week with the cars weight on them they could be pretty bad - would usually smooth out after 10-20 mins of driving though

-Stu

My swampers used to do it, got em balanced no more problems.

take your tyres to a place that does truck tyres.. they should be able to sort you out.

Low speed tyre wobble is caused by out of round tyres, balancing normally wont fix them

dogoff wrote:Low speed tyre wobble is caused by out of round tyres, balancing normally wont fix them

Correct, but having the tyres balanced (as best as can be done) provides a better ride when the tyre is out of round.

juzzydykes75 wrote: and am gonna try to get them balanced at another tyre shop at tyrepower flatly refuse to even try.

I'd be keen to know the outcome and to wheather another place can balance them and then wheather or not the wobble goes away. Maybe try Cross Way tyres in mornington as they do lots of truck tyres.

did you put them on in their original locations. Could be directional wear causing the problem

I had this problem in my Middy my rims had slight buckles which pushed the tyres out of shape at times it was extremely hard to control the truck.

if you get them balanced while out of round. What happens after you drive it for a while and they become round again? Wouldn't that make it all out of balance again?

My swampers do this when they are stored deflated for a while, after a few minutes driving at road pressure they come good. I usually pump them up and drive roudn the block a few times slowly. Even overnight at low pressures they will slightly flatspot till i drive on them a bit.

Layto....

Yumsylux wrote:if you get them balanced while out of round. What happens after you drive it for a while and they become round again? Wouldn't that make it all out of balance again?

How ? the actual weight variations around the tyre remain the same.

have you tried rotating them front to rear yet and if they are out of round they should be able to tell which ones are when there on the ballancer that what i look for when someone comes in for a wheel ballance anyway.

A simple way to identify an out of round tyre at home is to simply jack up one wheel with, say 5mm, of gap between the tyre and the ground. Then spin the tyre around and see if the gap increases as the wheel spins. It should keep a constant gap as the tyre is spun.

love_mud wrote:

Yumsylux wrote:if you get them balanced while out of round. What happens after you drive it for a while and they become round again? Wouldn't that make it all out of balance again?

How ? the actual weight variations around the tyre remain the same.

Yes the weight variations are the same, but the distance of the "weight" from centre is not. Try two identical weights, say 500 gm on the end of a broom handle, find the mid point of the broom stick now spin it around above your head. Now grab it off centre, weight distribution "roughly the same" but distance not....................hard work isn't it????
Juz.

When and if you swap them around the shake should change from the steering controls to a full vehicle shake.

depends on how bad it is if we have a dud rim at work it goes to lhr and customer is told about it takes alot more to shake a car than steering and you don't notice it no where near as bad.

Juzfishin wrote:

love_mud wrote:

Yumsylux wrote:if you get them balanced while out of round. What happens after you drive it for a while and they become round again? Wouldn't that make it all out of balance again?

How ? the actual weight variations around the tyre remain the same.

Yes the weight variations are the same, but the distance of the "weight" from centre is not. Try two identical weights, say 500 gm on the end of a broom handle, find the mid point of the broom stick now spin it around above your head. Now grab it off centre, weight distribution "roughly the same" but distance not....................hard work isn't it????
Juz.

IA 36 inch tyre is only doing about 350 rotations to cover a kilometer, so it just aint spinning all that fast (not fast enough to make a signifigant diffrence to the weights on the tyre that is marginally out of round)

The type of weight discrepancy that I had to make this condition occur was 200grams or more. The minor alteration in the circumfence of the tyre is simply not going to make any significance to the balance.

To use yur stick analogy, If I cut 200grams worth of wood of one end and added a 200 gram lump of lead would the stick still balance ? if you used the original centre point

Try balancing a badly flat spotted tyre on a 16 inch rim with the 15 inch rim setting selected on the computer tyre balance and see how much difference it makes......