someone posted a thread a while back where they had the 10 holes made into skinnies for the front. Looked reall awesome. U can also have them widend. I wouldnt advise going with a 275 on a 7" wide wheels. really need a 9" wheels for them
Im running weld 10-hole 15x7's with 275/50/15's on the rear.....the tires fit nicely and touch the road nice and flat, but still bubble over the rim enough to look cool! When I got the car it had 295/50/15 on the rears and those were way too big for those rims....driving in the rain was a nightmare....but yes, that size will fit nicely on a 15x7.
I used some 275/50/15's on my Ten Hole wheels for awhile. They worked ok, but they really need atleast a 8" wheel. The class I race in now has a limit of 235/60/15 DR's, and I've gone 1.6760ft on those.
it can be done but the problem is getting the full print of the tread on the ground. if only 255mm of the 275 is contacting the road surface then you might aswell have 255's on the rear.