There are lots of things the rider won't notice which the timekeeper can measure.
...and then there's the physiology.
The classic Dynamo conversation at the start of the ride that goes along the lines of: "There really isn't any drag" changes after they've hung to your wheel for 100km to "I'm sure there it's some dynamo drag".
...and then there's the physiology.
The classic Dynamo conversation at the start of the ride that goes along the lines of: "There really isn't any drag" changes after they've hung to your wheel for 100km to "I'm sure there it's some dynamo drag".