This is difficult to quantify since it depends on the bike in question, the bike we’re comparing it to, the speed you’re riding at, and more variables. It is always important to remember that the percentage of drag attributed to the rider is around 80 to 85 per cent, with the bike making up a much smaller percentage.
In terms of integrated cables, when Merida released its new Reacto, it claimed a two watt saving, per cable, at 45kph.
Asked how much free speed aero integration might afford over a traditional round-tubed bike, Cervélo’s engineering manager Scott Roy says: “There are many variables that go into an answer to this question, such as: handlebars used on the round-tube bike, does the round-tube bike have internally routed cables/brakes through the frame,…