Originally Posted by
njkayaker
The wheel sensor will be more accurate over longer distances too (as long as the circumference is accurate).
The GPS distance will be shorter (by a bit) for a curvy path than the wheel sensor because the GPS is measuring straight lines every 1 second while the wheel sensor is measuring straight lines every 0.33 seconds.
That's one piece of the puzzle, but it isn't a serious issue unless the route is very curvy, like you might encounter mountain biking. On typical road routes, it doesn't introduce a significant error.