The gear ratio is determined by the size of the front chainring compared to the rear cassette cog. A higher gear ratio, achieved with a larger chainring (with more teeth) or smaller cog (with ...

If you want to go ‘Full Zwift’ with your multi-gear home trainer, it has never been easier. With the Zwift Cog and Click, you can quickly swap your cassette and freewheel body for a single speed ...