which means smaller CdA.... their wind resistance would be way way lower even when not aero
According to bikecalculator.com, 70 kilo rider, 9 kilo bike, 150 W in, gets 28.44km/h on the flat. or 11.4 km/h up a 5% grade 7 kilo rider, 3 kilo bike, 15 W in, gets 15.66 km/h on the flat or 7.9 km/h up a 5% grade
So the toddler will drop to 50% of their flatland speed and teh adult will drop to 40% of their flat speed.
