I am a road triple novice. I have an older bike with an avocet triple on it, but I admit to just keeping it on there for show...but I'm doing Ride the Rockies in June and am feeling the need for lower gearing. I got a campy triple, and out of the wrapper it has a 53/42/30 on it. I have a 53/39 set of rings that I can put on it to replace the 53/42 set...

Is this a bad idea? what are the pitfalls?