As it happens I did the same TT last year, so you can have a look at my pacing stratergy here.
My plan was fairly simple, I looked at Best bike split and got an idea of pacing but I wanted to keep it simpler than all the diffrent powers they sugested.
- On the steeper sections of hills go about 5% over threshold
- On the False flats and flats go at high end of sweet spot
- On the downhill, get as aero as possible and power was secondary. (There is a 5 min downhill section -3% where I averaged 33mph, at that speed aero is way more important than Power. On the second lap I reached a higher max speed because I stopped pedaling sooner and got into a super tuck.)
As for the pacing I did it breaks down to about the following.
- The two climbs on each lap (About 3-4% gradient) lasted around 5 mins and I did them at about 105-108% FTP.
- The flase flats (averaging about 1-2%) were about 92-95% FTP
- The Flats and slight downhills were about 90-92% FTP
- And the downhills (Again about 3%) were 85-90% (Or 0% when i span out)
I also managed to do exactly the same Power on each lap, and the final climb was my strongest climb (So maybe something slightly left in the tank?).
PS, I’m estimating my FTP at the time as about 325w, I don’t know exactly what it was at the time. As this happened to be a road bike TT and I had done most of my Interval training and Tests on my TT bike. But it gives you an idea of the diffrences in power between the sections.