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Suspension & Braking
Have some questions about suspension or brake setups for your E46 BMW? Get all your answers here!

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Old 10-15-2010, 01:31 AM   #1
tylerc
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Join Date: Apr 2007
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Tire wear help!

I have a couple of questions about some tire wear on my last set of tires.

First question is about my front tires, They are worn significantly on the inside which I know is negative camber, however they are also very badly scalloped. I had bad fcab and these are now replaced, is there anything else I should check before I put new tires up there that could cause the scalloping? All in all 50k out of pilot sports and still having tread im happy with.

My rear tires didn't last very long at all and I do mostly highway driving for my job. The strange part is that the most wear occurred not on the very inside corner like I would expect but if you divided the tire in half, it was the half closest to the outside of the car on the inside half of the tire. I am going to replace the RTAB since I have urethane ones sitting in my garage before my alignment but is there anything else I need to check to that could cause accelerated wear?

Lastly opinions on alignment settings for best tire wear while not horribly compromising handling would be appreciated. I have to carry about 100lbs extra stuff in my trunk so I would assume I should leave that in my car for the alignment. Seems a lot of ppl are around -1 camber front, -1.5 rear. Would -0.5 front and -1 rear be a good compromise for tire wear? How about toe?

Thanks guys!

Last edited by tylerc; 10-15-2010 at 01:34 AM.
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Old 10-15-2010, 02:40 AM   #2
mkodama
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-Wear on the inside of the tire does not mean necessarily mean camber, it usually means toe angle or other issues.

-An additional thing I have read that can lead to tire scalloping, in addition to loose bushings, are worn out dampers.

-Altering alignment settings is best left to either a race shop engineer, or somebody who is willing to go back for a couple of alignments and experiment with what they changed. Unless you are going for either of those routes, just make sure you are bringing your car to a service center that can do a very thorough and precise alignment with settings to the correct car. Ask for a printout of the before and after alignments, make sure your car has those 100 pounds of supplies and a full tank of gas, and make sure the technician can roll the car back and forth a few times and alignment not change on the alignment machine. Also, looking for shops with a bright red alignment machine branded with the name Hunter is a good start.

-Lastly, the best way to get good tire life is a good set of tires for the driving you do, coupled with a good alignment. Quality tires intended for long wear and low rolling resistance will save you on gas, additional tires, and the associated installation costs.
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