It isn't about the diameter.

215 to 245 is 30mm extra width, 15mm on each side. That's 5/8 inch. Take a look at your present 215 tires & see how much space there is between the inboard sidewall to the shock or the upper ball joint or the top of the steering knuckle. Check the outboard side against the fender lip.

Make sure you check at the extremes of steering & suspension deflection.