Read this thread:
https://www.bimmerfest.com/forums/sh...d.php?t=668729
Ive posted a ton on alignments, but this thread is a good summary.
A couple of takeaways:
1. Every car, every mfg, every model- the alignment 'specs' define a RANGE of values. Do not assume it is a binary thing- 'aligned' or 'not aligned'
2. Within these specs there are 'better' alignments.
3. BMW dealers and many tire shops are, in fact, pretty clueless.
4. Yoiu are 'allowed' to ask for specific numbers within the recommended range
Having said that....
BMWs have some camber in the rear, which improves handling ...HOWEVER... do not assume that is THE reason for inner edge wear. Here is the key: **TOE** on any wheel will accelerate the expected wear. SO while you can see the camber and think "oh thats why the edge wears", in fact you will likely see way too much toe on that wheel, combined with the camber.
Good news is by dialing back the toe, you can keep the camber for good handling, and get a ton of tire life.
As you will see in the thread- my recommendatiosn are simple:
0.01 to 0.02" toe in, each tire
Camber and caster mid spec, balanced from side to side (ie each axle)