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      11-09-2012, 09:18 PM   #20
That's what she said...
bigjae1976's Avatar

Drives: 11 E90 M3 Individual
Join Date: Mar 2006
Location: Milwaukee, WI

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2004 BMW M3  [4.50]
2011 BMW E90 M3  [5.00]
2013 BMW 328i  [5.00]
Originally Posted by M3SQRD
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
Lol...anytime! Still, my apex and OEM wheels have a taper on the back, appears to be at least 3mm. So is 2mm of engagement fine? I'm not an engineer but I know enough to make me dangerous.

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