Originally Posted by M3SQRD
HRE uses a smaller wheel hub chamfer than OEM and other wheels so there is > 2 mm of hub engagement with a 5 mm spacer.
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.