I've noticed the speed and ride distance are different on my iphone compared to my bike computer. On the iphone i'm using gps lite and on the bike its a VDO computer. When I set up the computer i did not go with the recomended number for the tire size. I put the wheel and tire against a wall level. Used a two foot square on the floor touching the tire and measured the distance from the square to the wall. When i calculated the number it was different than the chart but it was the one i used. For example the easy ride i just did the bike computer says i went 13.75km and a max speed of 30.12km and the phone says I went 13.18km and a max speed of 38.4 km. Which one do i go by? or do i set my bike computer to the number on the chart for a 2.1 tire?
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