Steve777
- Member since Feb 25, 2010
- Male / 46
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Genève , Switzerland - 0 Followers
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Steve777 mikekazimer's article
May 7, 2019 at 4:53
May 7, 2019
Video: Are 29/27.5" Mullet Bikes Faster Than 29ers?
To get a statistically significant result (defined in this case as one where you're at least 95% sure what you're seeing is not down to chance) you'd need to see an average time difference of at least 5 seconds between each wheel size (based on a simple 2-sample t test calc). You'd never expect wheel size to make that much difference, so this test is 'underpowered'.
If you want to be 95% confident an observed difference as small as 1 second is real, then you'd need to do more like 25 runs on each wheel size. Realistically you'd need to use multiple bikes and riders, or do it over a week.
It does make me wonder how the pros do timed testing of components. As the benefit from each change gets smaller, the number of runs you need to reliably spot an improvement becomes gigantic.
Selling
Jun 13, 2017 at 0:09
Jun 13, 2017WANTED - 26" 160-180mm Fork - Straight Steerer
$400 EURLooking for a 160-180mm fork in good condition for my old Intense Slopestyle. Needs to have a straight steerer and 20mm axle. The fork would need to be shipped to France or Switzerland, or I could do local pickup in or around Geneva or Chamonix.
May 3, 2016 at 22:49
May 3, 2016
