1 other issue not stated is cable drag. The cable routing of some bikes is like the Gordian Knot (mentioning no names, However they converse Canadian French to aero obsessives, another makes incredibly, pretty large bikes & throws them & worst of every one of the 'highly rated' price bike https://rowanllivm.theisblog.com/33025100/top-latest-five-indexing-bike-gears-urban-news