Is the included trainer skewer compatible with a thru-axle? September 12, 2019 21:03 Updated 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 Fliiiight compatible with thru-axles? How do I install my bike on the Fliiiight trainer?