Originally Posted by
redfooj
wat?
Originally Posted by JohnJ80
GPS based Bike computers typically compute the wheel circumference over many wheel revolutions. I would guess they update that on occasion. Cycling computers without GPS, you have to set it and there is no check on that over time.
FWIW, I found I had entered my wheel circumference incorrectly when I compared the results given by my GPS based bike computer. So I'd go for the bike computer as accurate (or the gps in your phone) over distance.
J.
Pretty much true if you have the wheel speed sensor connected to your GPS computer as it would then use this for instances when a GPS signal is lost during operation. As in heavy tree coverage over a ride.