Sort of by accident, I ended up going for a ride today with both a Cateye cyclometer and a Garmin Edge mounted on my bike. Cateye on the left, Garmin on the right. Having never done this before, I was, of course, curious about whether they would register the same data.
Though I set up both according to instructions (tire size, etc.), the Cateye consistently registered speeds about 0.5 mph faster than the Garmin.
I am compelled to understand this illogical inconsistency, and so I am asking for your help.
- If I go to the road forum, they will tell me that MPH doesn't matter and I should buy a PowerTap instead.
- If I go to the electronics forum, they will tell me to rewire one of the computers so they are consistent.
- The mechanics forum would tell me to re-read the manuals and re-adjust the computers.
- The training forum would tell me to throw away the Garmin, thereby increasing my average speed on all rides by 0.5 mph (a pretty big gain...).
However, I think only the 50+ forum has the wisdom to answer this question for me:
Why is the left hand side of my bike faster than the right?