Depends on the rim size as well. I have a CR-18 in the 451mm (20") size and it's the easiest rim I've ever had for changing tires. But the one I have that's 622mm (700c) isn't nearly as good for that. I second the suggestion to use thinner rim tape if you have a rim/tire combination that's too tight. Conversely, thick rim tape is good if the tire fits too loosely and you're concerned that it might come off if you get a fast flat.