Deadsouls,

It looks like the one I bought for my wife. She never even turned it on most of the time and gave it to her brother. He decided after re-wrapping his handlebars he didn't want it. He gave it back, but lost the directions, so I'm in the same boat as you. If you do find info, please post.

The only reason they didn't like it was because it's hard to see during day light. IMO, I think it was the angle they kept it at. My Trek is the same way at some angles.

But anyway, you need to do a roll out to get the size of your wheel to put the number into it. (Roll out is one revolution of your wheel...some people say three revolutions are better and then divide by three for the number.) You'll just have to play around with it pushing a button, or combinations of buttons, to find the screen where you'd put the number in. There are also presets of wheel sizes...but as you know, every wheel with this tire or that tire will be a little different.

BTW, all numbers are metric. If all you have is a tape measure in ft/in, then take the number and convert to metric. I seem to recall it's 25.4 x's inches gives the metric...but look it up to make sure.

Bob