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      11-09-2012, 08:50 PM   #19
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Drives: E92 M3,R56 S,F22 228iX,F82 M4
Join Date: Jun 2009
Location: EC

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Originally Posted by bigjae1976 View Post
Even then that's not a lot of material. Just went through a class at the track this past weekend about fatigue and parts breaking. I would imagine that as you have less contact between the inside of the wheel and hub lip that the load is transferred to the studs/lug bolts. Given the experiment we witnessed...the life of the wheel fasteners is greatly compromised.

I ran a 5mm space for awhile but I had a 3mm hub extender.
It's a simple "hollow-pin in socket analysis" under combined bending, lateral shear and axial load. Only the hub reacts a portion of the vertical shear - you'd be amazed at how much shear a lip with 80 mil of engagement with a 2.85"-diameter can carry. I'm comfortable with the > 3-4 mm of engagement I have with a 5 mm spacer. However, thanks for your concern