Originally Posted by ancker

I've found Strava to be extremely inaccurate. I don't have absolute hard data on that as I don't have a power meter, but I often see stretches of my rides where I was doing 25-27mph on a flat and Strava somehow calculated 0W. Then it'll shoot up to 400W and sit there for a few minutes with absolutely no change in elevation whatsoever.

To be honest I pay no attention to Strava's power estimations, they just don't have enough information to determine accurate numbers when I have a total of 400ft of elevation gain over a 70 mile ride. This is also why I suck at climbing.