Bike computer

[SouthernBelle]

You can usually find an inexpensive puter even in a bike shop and they would set it up for your too. Don't you just hate the way you have to get your wheel size on most of them!

[OakLeaf]

Another vote for Cateye.

[violette]

Ditto on the Cateye

[Zen]

Cateye here too.

I've learned the hard way that it doesn't pay to be cheap.

I think I paid about $30 for mine. If it lasts three years, thats ten dollars a year.
Bargain.

[Melalvai]

Next time I need an odometer I'll buy Cateye.
And next time I need anything else, I'll get input first before randomly picking something!

[bean fidhleir]

I'll play contrarian: I bought a 5-function, wire link Planet Bike ($12 or maybe $15) for my frankenbike and liked it so well that I bought another one for my mixte. The instructions are extremely clear so that it's easy to set the wheel size. The device provides readout in miles or kms, has both a trip and a total odo, and of course provides current speed. It even has a clock.

[Fredwina]

I have 2 sigma's - a BC2006MHR and a a BC1200
Try this link:
or:
"# Multiply the wheel diameter in mm by 3.14 then divide by 1.61 (to convert to mph)
# Measure the distance travelled in one complete turn of the wheel then divide by 1.61 (to convert to mph)."
That being said, the pictograph (hieroglyphics? ) manual does take some getting used to. I do like the fact that they mount with rubber bands(honest!) so you do have to have worry about Zip ties if you want to move it to another bike.