Kiwi Giant
Active member
I'll admit that this is a complex problem. You need to work out if this is a Garmin setup issue or a Giant sensor issue. I would open the Giant App on your phone and record the odometer reading (total distance travelled on the bike) ride a route that you have measured out on Google Maps, say a distance from 5-10km. Recheck the Giant app odometer at the end and then see if it matches roughly the distance from Google Maps and then compare with the Garmin distance. What matches is OK, the other is your problem. Obviously the further you ride the greater the disparity should be. Other suggestions, delete all sensors from the Garmin and then reinstall them. Possibility - the Garmin is using GPS data alone without references to wheel size? A speed sensor may just confuse things more at this stage...
If you could borrow one and delete all sensors but that one then see if that helps you... But?
If you could borrow one and delete all sensors but that one then see if that helps you... But?