Quote:
Originally Posted by aerobod
One thing to ensure with spacers is that the chamfer on the back is sufficient to allow the spacer to sit flush on the hub and the hub-centric boss sits inside the wheel centre hole without touching the chamfer.
This can be tested by inserting a piece of paper between the clamping surfaces and ensuring it is gripped all the way around the circumference. If the spacer rocks in any way against the hub or wheel mounting surface, do not use it.
During a track day in 2021 we had a brand new M2 lose a front wheel at 160km/h when all the aftermarket studs sheared (luckily limited damage and no crash). At first it was thought there had been a bad batch of studs, but it was eventually tracked down to the spacer chamfer and the spacer not sitting flat on the hub.
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This issue rarely comes up for discussion.
James Clay of Bimmerworld created a video to demonstrate it:
https://www.youtube.com/watch?v=lK0bzjInqWU.
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