What rubber would cause one tire to wear rounded... i checked the tire for play and had none... the only thing that is probably worn out is the subrframe bushing.. i think i am missing something because i can hear a knock in the suspension when turning the wheel but cannot see where it is coming from when up in the air on jack stands.... all the other tires are fine and in good shape... i have michelin tires on there.

mine did the same thing too ended up being a REALLY bad upper control arm and tie rods. I suppose wheel bearings could cause this too?

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Java Developer/Linux SysAdmin

Current:
*1984 300D ~200K,1989 MR2 250K, 2012 Ford Fusion 4.5K (fiance's car to replace the uber-unsafe cavalier)
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Past: 1998 Chevy Cavalier ,2005 Saab 9-3 2.0T, 1996 Mazda Protege, 1974 Porsche 914 2.0, 1997 Land Rover Discovery 4.0L/5Speed, 1995 Jeep Wrangler

Front or rear tire?

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1981 Mercedes 300TD, 1994 Honda Civic Del Sol
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... all 4 of my tires are round...

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
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My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

its the front drivers side...

I have no sway while driving, no pull to left or right. and no shaking.


I have rotated the rounded tire to the back to see if the other one gets rounded... i will be buying all 4 tires soon but want to address the problem on the older tires... I have noticed i need subframe bushings but they dont seem to be in too bad of shape...

you get better gas mileage with square tires right?

What car?

Yet I'll add check the upper control arm bushing.

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83 SD

84 CD

I'd expect anything that allows the wheel to wobble from vertical (ie. a camber wobble) would do that, UCA ball (although not in my experience), wheel bearing, lower ball joint.

When my UCA's go, I get edge wear, but only on one side (the inside, IIRC). I think the springs force them toward the centerline of the car because the ball wear is always on that side of the pocket.

If you're getting even wear on both inside and outside edge, my bet is on wheel bearings being too loose. That's the only thing I can think of where the massive forces from the spring won't force its play and cause a camber shift more in one direction than the other.

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