What's a "Compact Triple"? If a triple, why would you need something other than 52-39-30 unless you wanted a smaller granny for either lower gearing or a tighter cassette. I've found my 12-30 cassette to be adequate and 30-30 will get me up some pretty big climbs. Since I'm 68 y/o and 200 lbs I'm not sure anyone younger would need lower unless they're either touring or going up sustained grades >15%. Having said that I'd go lower if doing a 100K with 100'/mi of climbing.