Probably because all terrain tires don't balance well and will pretty much always be noisy when compared to an ht, st or apt tire
im with you on the WTF test tom.. take the lexus ls460 for example.. factory 19 inch (457.2 mm) wheels.. with a 60.1 mm center bore.. and they are balanced through the center opening... so any imperfections get multiplied 7-8 times by time they hit the outside of the wheel
imho (but have no way to verify) the reason that car wheels typically come with hub centric rings is because on a car, new rims often means low profile tires. in that case any vibration will be felt by the driver because there is very little tire sidewall to absorb it. of course this doesnt apply to guys who go with 22s or larger on their trucks
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