Echo J12 Cycle Computer Manual -

To ensure accurate data, the computer must be programmed with your bike's specific wheel circumference.

Use zip ties to attach the wired sensor to the front fork leg (right side is typical, but left works too). Position it so it points toward the spokes. echo j12 cycle computer manual

This is the section most users search the manual for. The J12 cannot calculate speed or distance accurately unless it knows the circumference of your wheel. This is the "Wheel Circumference Value." To ensure accurate data, the computer must be

Random “manual download” sites that ask for a credit card. The Echo J12 manual is always free. This is the section most users search the manual for

The fork sensor has a screw-less rubber cover. Pry it open with your fingernail. Replace battery with (+) facing down (toward the circuit board).

Before your first ride or after a battery change, you must initiate the computer to clear any residual data and ensure accurate tracking.