My bike has a 9-speed cassette. How should I set it in the app?

You can set the speed level in the app, supporting 3 to 14 speeds. If you upgrade to a higher-speed cassette and chain in the future, you only need to modify the setting in the app.

Path: APP → Settings → Device-adjustment → Replace cassette

The cassette speed is to set the total gear of the transmission [rear derailleur]. The minimum can be set to 3 gears and the maximum can be set to 14 gears. Once the total number of gears is set, you can use the [Change gears] module Verify; for example: the flywheel speed is set to 9. On the [Change gears] page, the maximum gear can only be switched to 9. Click the "+" gear again and a prompt will pop up: the maximum gear is 9, only Switch gears back and forth between 1 and 9 before the device issues instructions.