215/75R15

will these fit and not rub when turning?

don't think that's a problem, but WHY?

You loose accelleration, have a theoretical higher topspeed, though i think you wont notice any of the above.

No the problem is your speedometer, it wil constantly read to low by several miles, thats would anoy me, either drive 'to slow' or get speeding tickets....

And maybe, but thats just a thought, it might be more comfortable, but seeing the baloon tires I don't think it will do the handling any good either.

that is a huge difference. if you have 15" tires and want 215mm wide tread, you should get a 60 series tire.

speedometer reading will be 11.4% too slow. When it says 60mph, you'll actually be going 66.9mph.

(metric: it says 100km/h, you'll be going 111.4km/h.)