I'm in the process of converting my World Sport to a single speed, and want to utilize as many of the original parts as possible. The stock chainrings are 52T and 40T. Would there be any pros and cons to going with, for example, a 52/20 vs a 40/16? The gearing would be very similar (2.6 vs 2.5 ratio), and aside from aesthetics, is there any functional difference I'm overlooking? I'm new to the SS/FG thing, so I guess I'm looking for personal experience here. The bike will be used for a 5mi commute and longer weekend rides.