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Bike computer set up

Hello, this is my first post.
I've bought a bike computer, I don't know how to set up the speed, odometer, etc.
I have four numbers, form 0000 to 3999, I guess I have to input the cm or inches or something, when I change that number it changes the speed, etc. I.E, oooo, no speed, 3999 shows like 40 km/hs with a single revolution.
It is an unknown trade mark ( Jingyi ( a cheap one ))
Just now I set up a 3999, because is nice going at a fast speed and I've ride like 100km in one single day :D
Warm regards,
tristan

Thanks operator! That was a quick reply! :)
I will check it and tell you the results,
Regards,
tristan

Perfect! tire size: 26X1.90: group f:2055 that is the cm of one weel revolution, I set up that number, I'm going to go to a ride to chek it works.
Thanks again,
Tristan