Originally Posted by
TiHabanero
We found a 2mph increase in speed over the 15 mile course. It is a regular course that is ridden by all of us on a weekly basis as a time trial, thus we were all familiar with it. Held on same day for the helmet test and same day for wheel test between three of us, each wearing a different helmet, but using the exact same wheel set and tires. Wind conditions are almost always the same from week to week. It was as controlled a test as we could get. No kidding, the helmet did not help with reducing time over the course. The wheels without question did.
which shows how bad your test was. Based on publicly available information, it is virtually impossible that the wheels made a 2mph difference, even going from something like a 36 spoke box rim to something very aero.
It’s also highly likely that aero helmet would
make some measurable difference in speed.
there are so many variables you failed to control: wind speed and direction, temperature, effort of the rider, the placebo effect of believing you were supposed to be faster, etc, etc,.
you could have at least controlled for a constant power output.