Originally Posted by
berner
Part of the issue with speed on the flats, or anywhere else is that of cadence also known as how fast you pedal.
+1 There is no gear that will make you go faster. Technique, proper fitting (saddle height and fore-aft, relative position of bars to saddle) and fitness have far more effect than things like gearing and bicycle weight. There is also little to no benefit going from a 10 speed cassette to an 11 speed. Just keep the bike drive train as it is, maintain it well and learn more about riding.