Quote:
Originally Posted by PeteBlow
Well, the bike change took 13 seconds and the gap grew after it
But we don't know by how much more the gap would have grown if he had switched or if Pog didn't switch.
For a slow tourist who would have used the TT bike like a road bike the difference could be calculated based on power and weight (rider + setup). Assuming same power numbers for TT bike and road bike. The latter also isn't true for pros who can put out 10-20 watts more on a road bike compared to being in aero position on the TT bike. Also ignoring the fact that we don't know CdA numbers for anyone. A world class climber who never trains/rides in aero position will have smaller gains if he only does it a couple times a year on a tour time trial. (Or he just doesn't ride a TT bike there)
Vingegaard spent a decent amount of time uphill in aero position though and for longer stretches was going at a speed where the design of the TT bike still provides measurable aero gains. Especially towards the end of the course. IOW for somebody like him it does make a difference if he's on a 20lbs TT bike or road bike up the hill.
One important factor that I haven't seen anyone talk about is bike weight. Vingegaard was riding a P5 which weights less than 8.2 kg in his size. That means he can only save less than 1.4 kg on a bike swap because of the 6.8 kg weight limit. I didn't see any numbers for Pogacar's Calnago bike but the setup looked considerably heavier. So he could save a lot more weight by switching to the road bike.