Trail Line Lab makes mountain-bike descents measurable

Field notes

The timing page says runs are matched between trail-specific start and finish points, with most descents timed top to bottom. It describes cleaning up bad GPS points, assigning each time an uncertainty margin, and withholding conclusions when differences are too small to distinguish. For public records, the page says runs are checked again on the server; it also describes rider reports for disputed runs and separate e-bike rankings.