Bell F20 When I bike lower than 20km/hr the computer thinks that I am not biking but resting so it does not calculate distance and time. If I bike faster than 20km/hr the computer calculates time and distance again.

Try this: http://www.livestrong.com/article/189600-bell-bike-computer-instructions/ Actually, the number entered is typically the circumference of the tire in millimeters. Check on of the videos at this link: calculate bike computer wheel number Google Search

I’m happy to help further over the phone at https://www.6ya.com/expert/donald_f2ed37026a3ac881

http://www.sigmasport.com/en/service_center/produkt_support/bikecomputer/

Without input from the wheel sensor it will not calculate anything. If it's wireless maybe it lacks a good line of sight or it's too far away. Take it off the handlebar, prop the bike so you can spin the wheel and hold the computer close to the transponder to see if it indeed CAN see it. Then work out the distance or line of sight issue.

Don't fixate on your computer once you get it working. I destroyed a bike frame when I crashed while watching my first bike computer at the end of a ride.

Somewhere in the configuration program is the option; if you can't find it it in the instructions, that's probably because it doesn't have this option, in which case, you should try and trade the bike comp. off for an American-built one. (guaranteed to have MPH)

Did the same thing. Manual is incorrect. Hold only the left button for 3 secs. This will reset DST.

Many mounting brackets have an alignment mark on the sensor that should be aligned with the center of the magnet. The distance between the sensor and magnet is also critical, usually needs to be 1-2 mm.

This is the problem ouccured because of starting coil of ur bike.
The current is not passing is become very low because of that mostly the bike stop after some distance.

Did an obsessive search of this problem and found this: "Right Button" . . . click to display the "DST" (distance) than hold the "LEFT Button" for 2 seconds. YEAH!! Reset trip ONLY!! This problem is simply an error in the instruction manual. ~G~

when i first got mine it prompted me to enter the circumference of my tire in millimeters (mine was 2074mm). you can get back to this by holding the bottom button in the center (this button is really two buttons one on the left side the other on the right side; holding the center pushes both these buttons). when it rests you'll see the 4 digit numbers. i think u use the right button to change the number and the left to move to the next. remember the number represents your tires circumference in millimeters. for a quick approx use this calculation (Tire Diameter)X(3.14)X(25.4). So for me it was (26in)X(3.14)X(25.4) = 2074mm

road bike
20" 1596
22" 1759
24" 1916
26" 2073
27 2124
Mountain Bike
24" 1888
26" 2045
27 2155
28 2237

I hope this helps reset your computer. I also called you and left a message. I love my comouter. I can track everything on it.
Talk to you soon.
Ignacio

here are the wheel value for a Bell F20

Road Bike
20" 1596
22 1759
24 1916
26 2073
27 2124

Montain Bike
24" 1888
26 2045
27 2155
28 2237

I hope this helps set your F20 computer.