Originally Posted by TallTravel

Have you shared this with Strava support? I've found some of their support staff are very, very good.

Originally Posted by Sy Reene

Strava calculates max speed by looking at individual GPS segments (ie. avg speed between 2 closest gps waypoints).. at least that's how I read the synopsis. Garmin reads speed from the sensor which is calculating the resulting speed assuming a correct wheel circumference. So, both readings could be wrong. Strava won't use the garmin reading, because it is susceptible to being manipulated by users intentionally inputting fake wheel circumferences, and Strava attempts to level the playing field by using their own GPS data unilaterally across all riders.

In theory, the Strava max speed number you have could be closer to correct than the garmin reading you have.. or not.