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      12-17-2008, 08:53 PM   #70
ajd's Avatar
United Kingdom

Drives: BMW 340i Touring
Join Date: Apr 2007
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iTrader: (1)

Your last point is a good one - the cracking could lead to increased run out.

This site suggests manuf tolerances are typically around 15/1000th inch - or 0.38mm. Deformation of upto around 0.6mm is not visible to the eye.

Irrespective of the tolerances, I'm not convinced a deformation of such a small amount (e.g the 1mm reported above) that that is being observed above should result in a crack - unless the material properties of the alu alloy are somehow unusually brittle, or contain flaws which precipitate stress raisers and hence cracks during "normal" loads - both of which would suggest a manufacturing defect problem.

Good luck with this. The fact this issue is common suggest these wheels are not fit for purpose. The fact that all 4 wheels are out suggest the forces being experienced are far from abnormal in use, hence not fit for purpose!?