S
Smallwheels
Guest
Go Digital
The digital bicycle speedometers are more accurate than any car speedometer if you calibrate them properly. My speedometer cost about $13.00 on sale at www.bikenashbar.com. They have different sales all the time so visit there often.
The calibration process for this one was to just measure the distance of one full rotation of the wheel and enter the number in millimeters into the computer.
GPS is not always accurate. It's good enough for dropping bombs on a particular location but not for measuring speed. Missiles do just fine with GPS because they just travel in straight lines above the ground. If one uses GPS to calculate speed the road must be perfectly flat, and straight as an arrow, otherwise any extra distance due to curves is not considered.
The digital bicycle speedometers are more accurate than any car speedometer if you calibrate them properly. My speedometer cost about $13.00 on sale at www.bikenashbar.com. They have different sales all the time so visit there often.
The calibration process for this one was to just measure the distance of one full rotation of the wheel and enter the number in millimeters into the computer.
GPS is not always accurate. It's good enough for dropping bombs on a particular location but not for measuring speed. Missiles do just fine with GPS because they just travel in straight lines above the ground. If one uses GPS to calculate speed the road must be perfectly flat, and straight as an arrow, otherwise any extra distance due to curves is not considered.