Sounds a little too far. you will add 3/8" to width (not bad) but also 1 3/8" to
the dia. Rears should be OK with this but the fronts may be a little tight.

What about 215/65-15 or even 205/70-15   Either of these are just "one" size up
from stock. 215/70-15 is "two" sizes up.