Fred Weber it depends on the effort and duration. Flat 20k TT usually in the low 90s. Uphill, it will be lower. This video was taken on a slight uphill grade, about 1%. Cadence is around 80. I race best at higher cadence but when I move to a new more aggressive position, I am aerobically compromised for a bit and higher cadence is a challenge to keep up with from the resp rate side of things. It takes awhile to rebuild it. So far that's what I find TTing to be all about- you get used to one thing and then up the ante and lose ground and then work to regain the lost ground, figuring out how to get faster bit by bit.