About FlowlineDojo
A pump track is a loop of rollers ridden without pedalling: riders keep their speed by timing alone.
They push their weight down as the wheels run down the back of a roller, and let the bike come up on the way up.
What the model shows
The track here is one smooth bump per roller. Gravity, rolling resistance and the push are added up along the track: a push on a downslope adds speed, a push on an upslope costs speed, and friction takes a little every metre. The speed trace shows the result. The rider can change each roller's length and height and ride the new line.
What it does not claim
It is a simple one-dimensional model for feeling timing and energy. It is not a bike-physics simulator and not riding advice: on a real track, wear a helmet and learn from people who ride there.
How it behaves
No score, rank or leaderboard. The people at the track say what they notice after a ride. With reduced motion on, the picture updates four times a second instead of smoothly. Nothing is stored or sent.