Up until recently, the best solution for how to ride your disc brake bike on a stationary or indoor trainer was to ride the rollers. But with the Saris Trainer Thru Axle Adaptor, you can safely ride with your mountain bike or disc brake road bike on your Saris indoor trainer. Keep in mind that these adaptors are meant exclusively for Saris trainers, and are not compatible with CycleOps “PRO” or PowerSync trainers. Nor should you use the adaptors when riding outside. The Saris Trainer Thru Axle Adapter is designed for indoor use on Saris trainers only. But once you get set up, the adaptor makes it possible to ride hard even if the weather outside is keeping you indoors.