Hi again,
I refer to my previous comment...the hotter the tires the more likely the can bulge....and you said they were AOK when cold, but got worse when getting warm.
And the history of those tires is?? New and unused or new and maybe a little used?
Further, what's your spacers and ride height? Was the alignment (toe) re-set
and is the camber to spec or gone a bit wild?---
But what you have said now is air trapped between carcase and tread...
Hub-centric rings need a thorough check...if you can get a 2 thou feeler between the ring and the wheel or the ring and the hub, get proper rings.
If they are made of plastic and the wheel is tightened on the ground, per most manuals, that won't help.
Best in all cases to try to tighten the wheel off the ground .. then finish the job with it on the ground.
Further "bolt centric" or "stud centric" fitments are for trucks, not cars, and never for real cars at real speeds !
They are just useful phrases for sales folk.
Good luck
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