I don't understand the advantage of having an 11 speed (gear) rear cassette over say 10/9/8/7/6 or 5 speed cassette? Is this the same marketing gimmick as the 4 or 5 bladed razor? You don't get a closer shave from a 4 or 5 bladed razor than a 3 bladed razor, if you think so I would submit that it is the placebo effect. I understand that you need to stay in a range of your optimum cadence, but track bike racers manage with varying their cadence? You would think that spreading the seat stays further apart would make the bike less stiff, am I wrong in my thinking?