The Saris Trainer Thru Axle Adapter adapts a thru axle hub bike for a Saris bike trainer. This adapter is designed for indoor use on Saris trainers only and should not be ridden outdoors. Compatible with current basic trainers but not compatible with CycleOps PowerSync trainers. The Saris Trainer Thru Axle Adapter will help you make the best out of your bike training!