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Old 03-08-2007, 06:49 AM   #1
FrankM E30
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Why are the my front tires wearing out on just the insides?

The rear tires wear evenly, but the front tires wear out only on the inside of the tires. I need to rotate the tires to wear them evenly. I drive around 75-80 on the highway on my car, '87 325e. Why are just the inners of the front wheels wearing out? tire pressure? camber? bad bushing?
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Last edited by M3fan4eva; 03-08-2007 at 06:50 AM. Reason: spelling
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Old 03-08-2007, 07:00 AM   #2
KenC
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How low is your car? Negative camber is probably the culprit.
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Old 03-08-2007, 07:12 AM   #3
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i am an expert in the tire industry. its what i do. the most likely thing is like the other gentleman said negative camber. some keys reasons that this happens is lack of a quality alignment to make sure your camber is in spec. if the car is lowered then that alters your camber angles. it might not be possable to get it back to spec with out a camber kit. let me know how the car is set up or if it is stock and i could tell you more. ALLEN
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Old 03-08-2007, 09:42 AM   #4
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Hey, I have all stock suspension. The car could use an alignment, so that could be a culprit, but there is no alignment for camber, just toe in/out. right?
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Old 03-08-2007, 10:33 AM   #5
Brew
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You have too much toe out on the front.
Have the car aligned properly, and rotate the tires.
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Old 03-08-2007, 10:44 AM   #6
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I have that same problem on my eta...But I am pretty sure I'm running 2-3 degrees neg camber with K-Mac plates (still don't understand how they work)... I need to take a look at the alignment sheets that the car came with, as it was aligned at a performance shop.
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Old 03-08-2007, 11:06 AM   #7
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Quote:
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You have too much toe out on the front.
Have the car aligned properly, and rotate the tires.
bingo
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Old 03-09-2007, 08:22 PM   #8
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Toe eats tires faster than camber angle for angle.

Alignments tend to "wander" over time. Every 6 months at least.
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Old 03-10-2007, 06:08 AM   #9
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I would actually do it once a year, but I guess it depends on what kind of driving you do, and how much.
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Old 03-10-2007, 08:36 AM   #10
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Yes, as others said, it's not camber, it's toe. It's actually quite difficult to get the front tires on an E30 to wear with just negative camber, it's almost always a toe issue.
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Old 03-10-2007, 08:39 AM   #11
FrankM E30
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Great, thanks alot guys. I didn't think that it could wear with just toe.
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Old 03-10-2007, 08:49 AM   #12
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\___/ Toe Out

/___\ Toe In

I___I neither.
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Old 03-10-2007, 12:40 PM   #13
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Mnemonic device:
Worn on the inside-toed out.
Worn on the outside-toed in.
Learned it years ago working with stock cars. On solid axles, we corrected the toe after crashes with a torch and a wet rag.
Toe will eat up tires a lot faster than camber as previous posters have noted.
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Old 04-11-2007, 11:36 AM   #14
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Kind of an old thread, but here are the correct toe alignment specs for the 318iS and other stock suspension settings:

Front settings: Castor 8½º ± ½, Camber -2/3rdsº ± ½, Toe-in 0.028" ± 0.024, Steering axis inclination 13 5/6thsº ± ½

Rear settings: Camber -2º ± ½, Toe-in 0.080" ± 0.031

It is my understanding that when aligning, having the car as close to these numbers as possible will result in less wear on inside of the tires. Sadly, mine are shot in the front. I am running -1.5º of camber with my plates though, but when I aligned it a while back, the technician did not put it to these specs. I told him as close to zero as possible basically...
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