Cadence and heart rate are the two key measures that I use. Over a 30 to 40 mile solo ride, I can exert a strong and steady effort. Due to terrain and wind, my speed will vary greatly between 14 and 24 mph. So, I do not dwell on my speed from second to second. In the end, my average speed is all that matters, after the ride. On average, it is a simple measure of my average fitness. On the ride, I want to know, or work on, my cadence, my power delivery. Since I am reasonably fit, my legs do not tire easily. I can pedal at a cadence and for a period of time that will drive my heart rate to any targeted training zone. Knowing how fast I can spin and how hard I can drive my heart is worthwhile data for me.

Bill M