# HP output on a bike?

**URL:** https://boards.straightdope.com/t/hp-output-on-a-bike/161748
**Category:** Factual Questions
**Created:** [March 16, 2003, 6:48am UTC](https://boards.straightdope.com/t/hp-output-on-a-bike/161748 "2003-03-16T06:48:30Z")
**Posts on this page:** 3
**Page:** 1

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### Author: ![hauss](https://avatars.discourse-cdn.com/v4/letter/h/5fc32e/32.png) [@hauss](https://boards.straightdope.com/u/hauss)
#### Post date: [March 16, 2003, 6:48am UTC](https://boards.straightdope.com/t/hp-output-on-a-bike/161748/1 "2003-03-16T06:48:30Z")

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How much horsepower am i putting out at 25mph on flat pavement on a mountain bike? I weigh 190lbs.

Fuel

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### Author: ![scr4](https://avatars.discourse-cdn.com/v4/letter/s/59ef9b/32.png) [@scr4](https://boards.straightdope.com/u/scr4)
#### Post date: [March 16, 2003, 6:58am UTC](https://boards.straightdope.com/t/hp-output-on-a-bike/161748/2 "2003-03-16T06:58:55Z")

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Check out the [Analytic Cycling](http://www.analyticcycling.com/) page. For 25mph and default values for all other parameters, it gives 250 watts (0.33 horsepower).

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### Author: ![DreadCthulhu](https://avatars.discourse-cdn.com/v4/letter/d/db5fbb/32.png) [@DreadCthulhu](https://boards.straightdope.com/u/DreadCthulhu)
#### Post date: [March 16, 2003, 8:29am UTC](https://boards.straightdope.com/t/hp-output-on-a-bike/161748/3 "2003-03-16T08:29:08Z")

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Nifty page. Just for a little extra info, whenever I use an exercise bike, it normally reads me using about 100 Watts.