directedby

Cupping on both front tires -

Driver's side is worse -

Last week I had the Ball Joints and Tie Rods and d-link replaced - all were loose and badly worn.

I Put the rear tires on the front - they had been smoothing out and had very little cupping left -

And noticed today that the cupping is starting up again.

Is it that I fixed the problem but the tires have the cupping pattern so they are getting worse?

or

Is something else causing the cupping that needs to be fixed?

The only other thing I can think of is the wheel bearrings - but they were checked and were OK - my shocks are also OK.

Any thoughts?

TeraFlex

Mine did that some. I wasn't rotating them enough and wasn't watching my tire pressure.

mikesjk

How are your shocks? I have heard that this has something to do with it as well.

Autorotate

I just think the BFG KM2 is VERY prone to cupping. I had a set do it at 14k that were rotated every 6k. No other mechanical issues on Jeep.

Saw another do it on a stock JK with about 20k on the tires, but they were rotated ever 12k.

I'll be heading back to MTR's next time around.

river2c

I've had no cupping on my KM2s at all. What air pressure are you running in your tires?

thom1879

Are you rotating every 3-5k?

TEEJ

Cupping is almost always the tire bouncing rather than maintaining contact with the road.


Its almost always worn shocks, or, inadequately valved shocks for the tire/axle combo in use.


For example, the heavier the tire, the higher the compression valving that you need to help control that weight and the momentum involved.

If the shocks are in good shape, but have too low a compression setting, well, you can have cupping.

All that bouncing can wreak havoc on other parts too.



Depending on the specific cupping patterns, other things can also be wrong, but, 90 times out of 100, its the shocks.

What shocks/valving are you running?

nangulator

X2, I have seen some VERY wasted ball joints cause cupping but it is usually the shocks

directedby

shocks see OK -

directedby

i have tried various tire pressure - usually run 30psi