Idk , if you can base the quality of a bike based on a weight of "x" over...You can have a light weight bike with a heavy beating person on it and that counters that...You can be a "jockey on a horse" so to speak and ride a bike that is considered "heavy" but yet as little impact from the rider. Quality is based on "specs" and not simply total weight factor...which can be important within the intended use but not necessarily overall
When it comes to sizing within a line, what drives that is the intended use of the mfg models. One might find the road bikes have more options in size compared to a mountain bike or even multi use. I dont think that is driven by price and sales channel (walmart example) but rather intended use. Cruisers are basic sizes a 29 is rare but they exist.
If we probably looked at the history of these mfg's we would most likely see some trend in sizing. And I would guess it would be specific to the type and mfg's market..
Last edited by EnjoyinTheRide; 12-12-16 at 11:38 AM.