Just a short one today to update the chart from the one I posted here and on other social media forums. Click to see bigger version.
Different reports of barometric pressure of 1031-1036hPa and air temp of 30.3C inside the track mean that Wiggins must have been exceptionally aerodynamic and recent work on his bike and position at the track suggest some good aero gains were made.
I estimate a power to CdA ratio of 2500-2550W/m^2 was required.
There are of course a range of assumptions:
- Total mass: 82kg
- Crr: 0.0023
- Drivetrain efficiency: 98%
- Altitude: 50m
- Relative Humidity: 60%
If drivetrain efficiency is better, say 99% and Crr at 0.0020, then it drops the power to CdA ratio down to 2200-2220W/m^2.
and perfect pacing.
Just on that, my colleague Xavier Disley has once again produced a lap pacing chart - here it is:
That's a very slight fade over the course of an hour, which in my humble opinion is pretty much perfect. Opening few laps a bit hard, but that's understandable as a rider seeks to control the adrenaline rush with thousands in the crowd watching on and cheering.
The high air pressure did cost distance, and on another day perhaps 55km was within reach.
As for going to high altitude, well there are many variables, but another 1-2km is feasible. See this item for more on that.
Well done to Brad Wiggins. That's sure a fine ride.