>>1174855WARNING: Autism incoming.
50/34: "Compact" crankset. Used for Fall training, if you follow a "traditional" training program (like in Cyclists Training Bible) that includes a long Base Training period. Also good for recreational riders who do little actual training.
53/39: "Standard" crankset. Used for post-Base training, and during race season, and by strong recreational riders.
52/36: "Mid-compact" crankset. Tradeoff between Compact and Standard. Paired with a wide-range cassette (like 11-28 or higher) gives you the ability to train and race all year 'round without having to have change cranksets. The main disadvantage is larger jumps in cadence between cogs.
46/30: Not a "standard" chainring configuration for Road, this must be mainly for training and racing in hilly areas that have few flat roads. Perhaps for weak recreational riders who can't climb even 5% hills with even a 34-tooth small chainring? Or is this more a MTB configuration?
50/39/30: Standard triple configuration for endurance road bike or MTB. Paired with a wide-range cassette, even a weak (or heavy) rider can climb most hills -- albeit slowly. Assuming they know how to use their gearing effectively.
