I'd say it's more than likely that the disc has warped slightly over time because of the bolt which is spinning.
There won't have been enough or rather equal tension at that point allowing flex in the disc. Much like a cylinder head which isn't tightened down correctly and will eventually warp and fail at that point.
As for the wheel, it might be worth trying to helicoil the offending bolt hole first, you may be lucky if the alloy hasn't deteriorated much.
Steve
There won't have been enough or rather equal tension at that point allowing flex in the disc. Much like a cylinder head which isn't tightened down correctly and will eventually warp and fail at that point.
As for the wheel, it might be worth trying to helicoil the offending bolt hole first, you may be lucky if the alloy hasn't deteriorated much.
Steve