1. ## Strava, Altitude, Watts

Not sure if this is the right forum. But I noticed something interesting tonight surfing segments on Strava. As you go up the hill to higher and higher altitude segments the wattages decreased. Fully to be expected for sure. Less oxygen, less ability to metabolize, less power output. I just never expected that it would be as obvious as it was. For instance, top riders on hole in the ground are in the 150watt range. Top riders on FHDL are are running 250 or better.

2. Post an example.

I think what you may be seeing differences because of rider and bike weight. Not a difference because of altitude.

3. This is measured (i.e. SRM) watts as opposed to calculated, right?

Because as you probably know, the power calculations on strava are more than a little bit suspect right now.

4. Hole in The Ground Complete Loop, start

complete divide loop

Here's a couple of examples. Definite difference in the watts reported.

5. Since none of the leaders have a real power measurement (look for the little lightning bolt next to the wattage) to check against Strava's "calculation", I'd take those numbers with a grain of salt.

Pretty much anything could be happening with regards to wind, riding surface, tires, etc. It's bad enough on the road, with a MTB on a trail I think those numbers may be close to meaningless.

6. Those examples are loops. Look at climb segments done on the road to get closer approximations by Strava.

7. Originally Posted by ghettocruiser
Since none of the leaders have a real power measurement (look for the little lightning bolt next to the wattage) to check against Strava's "calculation", I'd take those numbers with a grain of salt.

Pretty much anything could be happening with regards to wind, riding surface, tires, etc. It's bad enough on the road, with a MTB on a trail I think those numbers may be close to meaningless.
Comparing some rides I did on my road bike, the Strava estimate was sometimes off as much as about 25% of my actual power when comparing the data from my power meter.

I think it's great that Strava has this feature since not everyone wants, needs, or can afford a power meter. But the power data generated by the Strava is good for entertainment purposes, not for training or drawing any real comparisons.

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