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Excessive Rear Tire Inside Edge Wear

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Any update OP?

Just had this issue - the inside edges of my rear tires were absolutely destroyed in just a few thousand miles. The consensus seems to be:
1. It’s normal for staggered rear tires to wear somewhat quickly due to the camber (which can only be adjusted with aftermarket hardware).
2. Mis-alignment (e.g. toe) can make this problem considerably worse.
3. Removing the “low” suspension at highway speed seems to help for some people.

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check your tire pressures - yeah I know it's stating the blindingly obvious, but I have learnt to run mine at 45psi and the problem largely goes away, run them at 40-42 and this is exactly what you get (in as little as 12K miles)
Exactly this!!! 45PSI is the magic number for my 275/35/20s as well (P85D). Took me two sets of tires to settle on that number. First set I only managed 16K miles. Second set I bumped up to 45 and got 21K. Both were the same Falken Azenis FK510. Excessive negative camber needs to be fixed (have adjustable arms sitting in the garage), but 3-4extra PSI absolutely makes a difference.