Tadej Pogacar breaks 3 Strava records during his reconnaissance for Paris-Roubaix 2025 including fastest time on Mons-en-Pévèle

If you throw 2 identical golf balls at the same speed, but one is twice the weight, it will go a bit farther (wind resistance is the same, so the amount of energy of the heavier ball is higher). If you throw 2 identical golf balls at the same power, but one is twice the weight, it will go less far (the amount of energy is the same, so the lighter one is going faster). Remember that in a flat TT, once up to speed, the amount of weight is basically negligible (except a tiny amount of increase in rolling resistance). It's all power vs CdA. Probably the best way to think about this is with a truck (with a covered bed) over a flat but very bumpy road, and ideal tire pressure for the weight. Now, load the truck up to 3X the mass, change the tire pressure to the new ideal pressure, and do the run again. What will take the most amount of power? It's quite obvious that it's the run with the more mass. (Many of us have done this test in real world conditions without realizing it.) Why? Because there's deformation loss to the tire, which is somewhat worse when there's more mass, but there's also the loss from having to lift that much more weight over and over again.