Is the included trainer skewer compatible with a thru-axle? September 12, 2019 21:03 Updated Follow No. If your bike has a thru-axle, you'll need a thru-axle adapter in order to use the trainer. You can purchase one from the Robert Axle Project. Related articles Is using my Heart Rate Monitor with Fliiiight recommended? What are the dimensions of the included trainer skewer? Is it compatible with my bike? Upgrading to Fliiiight FAQ Comments 0 comments Please sign in to leave a comment.