The 300mm Mondeo calipers are tight even shaved on 15", 3mm spacers are needed on props ideally as well, 9 spokes spacers not needed, you would also need to static balance wheels as you can't put stick on weights where caliper would come into contact.
The difference between standard Puma, and Mondeo calipers and ST170 discs, means heat isn't a problem, even heavy track use will barely gets them warm.
obviously shaving does thin out the intrinsic strength, is there a way of calculating max calculated load/stress/inertia on an ST220 Vs what could be created by a Puma, comparing aero dynamics weight, top speeds....... and does the amount shaved at critical points exceed that, I doubt anyone ever has, or ever will calculate, and would ford release the calculations and design derived from that for the ST220 and what safety factor was used?
I have no idea on any of the above, but having done a bit in R&D in past, know that sometimes a part is needed, something is already available that is as cheap as getting something specified, that is tested to prove meets standard needed, and used, even though its complete over kill, I have no idea who made calipers, and what else the basic casting was based on, but without knowing, choice is yours, there will be people on both sides of fence, and many sitting on it.
Something getting stuck between wheel and caliper is a dubious, but possible arguement, and would be something I would love to see tested Mythbusters style, standard car, fit a 300mm disc and caliper one side only and drive into deep gravel trap, drag car out, see what happens when you try and drive,
my guess would be at worst, stone would gouge alloy slightly if it did become stuck, and then flicked out, as wheel alloy is very soft compared to a stone, but could it get in there in first place, as would have to be small to get in.......... I'll give up my ramblings now
