im going for 15" wheels this season. but the only size offset is +45 for 15X7" wheel. now will i have camber/rubbing problems? im lowered about 2.5" in the front and 2.3" in the rear. i have 16" now with a +40mm offset and i haven't had a problem with rubbing. any help would be appreciated. thanxx

 

that offset will tuck the tire even deeper back into the fender than your current +40 offset wheel(i'm assuming they're also 7" wide).i would say if you don't have problems now,you shouldn't with the 15" wheel.
BTW-the wheel has nothing to do with your camber.if you don't change your ride height,the camber will stay the same.
chris