Input the RPM ratios you need! Press enter after typing each value to add it to the list of searched ratios. You can change the settings before inputting a new target if needed. Decimal points and simple operations are supported (parentheses, +, -, *, / and ^). Once all the values you need are in the table, you can start the search with the check mark button.
It's not always possible to reach the exact value using Adjustable Chain Gearshifts. The accuracy of the search is how much leeway you can afford in the approximation; however, a smaller amount of leeway results in a larger sequence (less compact setup) and it takes longer to find.
You can decide to enable or disable results that are greater, equal or lower than the target. This is useful if you need a ratio ever so slightly larger than the target, for example.
When enabled, any valid results in the history can be used in the search process, saving time. You don't really want to disable this unless you're specifically looking for a shorter sequence than one of the results in the history, using a lower accuracy than the previous search.