| If you look at the tires (let's ignore road bikes for now) the vast majority is between 15ish and 28ish Watts (I usually look at Gravel and MTB tires). Then look at the methodology: > The total rolling resistance of an average rider with a total bike + rider weight of 85 kg / 188 lbs that averages 28.8 km/h / 18 mph will be double the rolling resistance you can find on our website. If you're heavier than that or average higher speeds, the total rolling resistance will increase roughly linearly with the increase in weight or speed. All I can say is that I am a lot heavier than 85kg with my bike and that I am usually riding at 20-25 km/h. So let's say the lower bound they mention would 2x15 and the upper bound 2x25. Let's assume 127kg with luggage, that scales linearly to 3x15 - 3x25, but the speed is only 2/3, so we can dial it back. My napkin math now says the difference between a good pair of tires and a bad one is 30 vs 50. And I'm still not sure if that translates 1:1 to the assumed typical 100 Watts of an average rider.. I found https://www.gribble.org/cycling/power_v_speed.html though and if I plug in my numbers, the coefficient of rolling resistance is our variable, and 0.00465 -> Rolling resistance is working against you with 5.79 (N) of force, or 50.15 watts of power. 0.00273 -> Rolling resistance is working against you with 3.40 (N) of force, or 30.01 watts of power. So the tires make about 2-3 kph, which fits what most people have posted when I was researching this. |