Join Date: Sep 2012
Location: NW Arkansas, USA
Bikes: 2012 Giant Sedona Hybrid
Listen to your wife dude! Close is good enough, just enjoy the ride and if in doubt, do a little extra.
Also, the GPS units are accurate and don't care about the wheel size etc, however if the sample size for waypoints is not short enough they can be off quite a bit on a longer ride if the ride is very curvy. Sometimes I zoom into my ride after importing it to SporTracks and can see that since it only samples like every 10 seconds or so that it will clip off a lot of the curves, the faster I go the worse it clips. It will show the curve on the map but the line that shows the route makes a straight line from one side of the curve to the other.
One big hill I ride on regularly has a real cool descent, I put the old girl in my tallest gear and hunker down and crank as fast as I can, it has a relatively tight long sweeper in the middle of it. The GPS must cut a few dozen yards off the results if it happens to sample just before and just after the turn.
Last edited by Rootman; 10-03-13 at 01:48 PM.