New bike computer... speed seems to be off?
I just picked up a new Sigma 12.12 (my 1st bike computer) and put it on my 2011 Giant Roam. It works great and was easy to set up, however, the current/average speed seem to be off. My ride in to work is 4.83 miles and the bike computer hits that dead on. It took me just under 20 minutes for the ride. Based on that, my average speed should be 14.63 mph, right? Or at least my math says so? The sigma computer said i was 15.5 mph. Can anyone explain how the distance seems accurate but the average MPH seems off?