I just bought a Bell Wireless Cyclocomputer (15 function) and I can't figure out how to set the tire size. Ive been holding down both buttons for different amounts of time and and I can't get it reset or to show me a screen where it only has four numbers . How can i set the tire size?

For the Sette Triton 12 Function Cycle Computer:

Go to the ODO mode, then press and hold the tiny "SET" button on the back of the computer for 3 seconds to go to setting.

Press "SET" button again to select between Km/H or Mile/H. Press large "MODE" button to go to Bike1 & Bike2 Setting. Then press "SET" button to select Bike1 or Bike2.

Press "MODE" button to go to Wheel Settings. Input the correct wheel size by pressing "SET" Key. the size it asks for is the circumference of the tire, in millimeters. You can find the circumference yourself by making a mark on your tire, pushing the bike forward until the mark makes one full rotation, then measuring the distance on the ground between where the tire started and stopped.

A table like this: http://1.bp.blogspot.com/_bTatB4zy3aI/Sh8Yx7IsnwI/AAAAAAAAABs/KHvHuoYuARA/s1600-h/circs.JPG
is included in the manual, and if you know what size tire you're using, I'm almost positive the number under "circumference" is the correct one to input into the cyclo-computer.

install the wireless driver first on the laptop

To reset the Belkin back to the defaultsettings -
Press and hold the pinhole RESET button at the back of the router and thenpower for at least 15 secs. Then release the RESET button.
Connect a LAN cable from Belkin to your laptop/computer's LAN port, open abrowser on your laptop/computer and enter the Belkin's configuration URL. http://192.168.2.1
The default PW = blank (just press Enter)You can now change the default admin password.
You can now configure the wireless settings. Now configure the wireless card in your computer/laptop withthe router's wireless settings.To secure your wireless network from unauthorized access,please click on this link and follow my instructions :-http://www.fixya.com/support/r3559128-wireless_router_security

You are correct, the Bell Wirless Speedometer doesn't appear to go above 27" for road bikes and 28" for mountain bikes.

You can find the manual (with programming directions) here: http://www.bellbikestuff.com/pdfs/111741WirelessManual.pdf

Contac them with your quest and tell them we are STILL WAITING for the promised web presence of user manuals.

http://www.bellsports.com/general-info/contact-us

They'll probably email what you want and make some kind of excuse. Too bad. Great products, so-so online support for those products.

2105 http://www.vetta.com/support/manual.aspx?type=cycling%20computers

There's a size chart on page 15 of the manual that has great instructions for measuring and entering the wheel size.

You can get the manual from Sigma's website at this link.

Method "B" is the most accurate way -- make a chalk mark on the tire and stand the bike up next to a wall with the chalk mark at the bottom.
Have a friend make a chalk mark on the ground at that point.
WITH YOUR FULL WEIGHT ON THE BIKE, move forward for one rotation of the wheel -- until the chalk mark is on the bottom again. Do this as straight-line as you can.
Have your friend make another mark on the ground at this point, and measure the line between the two points on the ground.

This is the wheel circumference, and if you do this with normal tire inflation and with your full weight on the bike, it's the most accurate way to calibrate your cyclocomputer.


If this helps, please be sure to hit the "thumbs up" for me.
If not, of if you have questions, use "add comment" to post back here, and I'll do my best to get you going.

I have the same Athletic Works stopwatch. I just figured out how to turn off the alarm: press either of the two mode buttons (middle top, or bottom right) until you see the regular time displayed (the seconds will be changing, but nothing else, and nothing will be flashing). Press and hold the reset button (top left); while holding down the reset button, press the start/stop button (top right). Watch the bell icon on the display in the upper right corner; with each press of the start/stop button you will see the bell either appear or disappear. When the bell disappears, release the reset button. The alarm is now off.

Here are some things the book doesn't tell you:
You have to completely reset the speedometer and lose your odometer to reset the MPH. Hold both buttons for 3 secs to get reset. (Remember to use the left button to walk through the setup process and use the right button to change the settings.) First set the wheel size using Ideluna's settings above on this page (right button to change the setting and left button to go to next number). Next is MPH/KPH, after wheel size setting, push left button again and km flashes. Push right button to change the setting to MI. Next is TIME. Push left button and you'll see the time. Hold down left button till 24hr appears. Push right button to change to 12hr. Then push left button to go to flashing hour. Change with right button. Then left button to go to flashing minute. Right button to change minute, hold down to change minutes fast. Now you are set up. Now the process changes, use the right button to walk through the menu and use the left button to reset. Don't push both buttons anymore unless you want to reset everything again. If you want to reset something just hold the left button down until 0. When you are in SCAN mode, push the right button to go to Time, To go back to SCAN once, hold the right button down - It will scan everything once and return to TIME. To go to ODO, push right button once, push again for DST, push again for MXS, push again for AVS, push again for TM, push again for SCAN to stay in SCAN.

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.