60x13 is 125", surely that's big enough for just about anybody in a race situation? And using a 12 is for training, obviously, even I have one. The sizes of rings people are running are just getting crazy, it's looking like a dick size competition. Not to mention the price- at my frequent local supplier, a 53t Zen chainring (biggest in my pouch) is ¥19,800. That's already spendy in my book. A 63t is ¥51,300! Who is paying that for chainring???