Quote:
Originally Posted by HighlandPete
So what are new discs telling you as an engineer? For me, it indicates there is the possibility of a poor original hub to wheel mount. I wonder if there was axial run-out on the disc bell/hat face ahead of fitting new discs.
Remember BMW wheels are hub-centric, the bolt holes should not have any part in accurately mounting wheels. I'm still interested in the actual hub spigot to wheel centre clearance, it should only be 0.1 - 0.15mm. Any chance you can check your setup?
I see how the wheel alignment pins and friction discs help an accurate wheel mounting, but something changed in the mounting of your rear wheels, when the discs were changed.... was it simply just a better mounting, or did the hub run to a tighter tolerance (zero axial run-out) with new discs?
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As you can see on there vernier caliper, i measured the wheel bore -> 66,74 - 66,76 mm, i had to cut my caliper with a grinder to enter it on the wheel
The hub spigot measure 66,5 mm
0,24mm - 0,26 mm difference between wheel and spigot