Training Stress Score is a way of measuring how much stress is put on the body from a ride. TSS® is calculated using Normalized Power® (NP), Intensity Factor® (IF) and ride duration. TSS® helps to determine the best combination of workouts and rest periods.

TSS® Guide

  • Below 150 – recovery for ride will likely be finished by the next day (low)
  • 150 to 300 – may be some leftover tiredness the next day, but gone by 2nd day (medium)
  • 300 to 450 – may be some tiredness Even after two days (high)
  • More than 450 – Likely be tired for several days after ride (very high)

Measuring the physical stress a ride has had will help improve the overall race performance and help make improvements to a training regimen.