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 Mar 23 awarded Popular Question Apr 16 comment What does a cyclocomputer actually measure for calculating the speed of the bike? I guess that it is not welcomed to cross post this question to physics.stackexchange and electronics.stackexchange as well. However is there another accepted way to notify users of those sites about this question? I am not sure if it is a good idea to migrate it to one of those sites. Apr 16 comment What does a cyclocomputer actually measure for calculating the speed of the bike? @heltonbiker I am teaching physics in high school. There are nice exercises in school books which consider cyclocomputers as real world examples in the context of rotating bodies, discussing frequency and speed... However sometimes it is assumed that a bike-computer measures in fact the time for one revolution and sometimes that it measures the number of revolutions in a given time interval. So I want get some background knowledge about how it really works (and not only how it could work in theory). Nevertheless your answer is helpful! Apr 15 comment What does a cyclocomputer actually measure for calculating the speed of the bike? @DanielRHicks So what method is used? Do you have more details? Apr 15 comment What does a cyclocomputer actually measure for calculating the speed of the bike? Yes that's the question. Do you have a reference for that? For me both methods seems to be reasonable, you could take a fixed time say 2 seconds and count the number of revolutions (that's what is actually used as you said) or you could measure the time for one revolution. Do you know why the latter is not used? Again the problem is really not how to calculate things once you have the measurements (that's one reason I included the formulas in my question, to show that this is not the problem...) Apr 15 comment What does a cyclocomputer actually measure for calculating the speed of the bike? Thanks. So it measures the number of revolutions per second (or per 5 seconds depending on the model) and not the time needed for one revolution? The problem is not how to calculate the speed out of the rpm or to convert units (by the way I am from germany where only metric units are used). Apr 15 awarded Student Apr 15 asked What does a cyclocomputer actually measure for calculating the speed of the bike?