245 is technically too big for the wheel, but a lot of people have fun that size including me. doing it again i would pass.
by 'roll' of the tire i mean this: when you turn, the sidewall has to flex until it tightens up allowing the tread to catch traction allowing you to turn. with wider tires on a smaller wheel this roll is increased, esentially making the car handle worse than with the correct size tire.
245/50/16 tires are also much more expensive than 225/60/16.