As others have said... yeah, 225/45 15 will fit. It's super duper tight in the rear (especially) but it'll work. Unless you've got a stockpile of 15x7's I wouldn't bother with it myself. Run the 225/50 14. Their slightly taller sidewall isn't bad thing in a SWB car like the CRX...

There's no way that I'd move an ITA CRX onto 225/50's. The taller tire height will raise the car, create clearance problems, hurt gearing, etc. No way, no day.