When using the bulk Strava import or the automatic Strava importing you can exclude the importing of activities that use specified Strava gear.
This is useful to filter out your road bike Strava activities from being imported to Trailforks (which is mountain biking focused).
To use this feature you first have to setup your bikes on Trailforks, and assign them with the corresponding Strava Gear ID.
Once you have your bikes setup with Strava IDs they will be listed on the Ridelog Strava import pages with checkboxes beside them. Checking a bike will exclude activities using that bike from being imported.
Another note, currently Strava activities marked as "commute" or "private" are also not imported to the Trailforks Ridelog.