We'll be the first to admit that hopping on the trainer and grinding out a session isn't our favorite activity, however, busy schedules, lack of daylight, and cold weather can sometimes force the necessary evil of pedaling indoors. Get your mountain or disc brake equipped drop bar bike and Tacx trainer ready for the pain cave this season with the Trainer Thru Axle. Designed to replace your stock thru-axle and interface precisely with Tacx trainers, you'll hit the early season spring races fit and ready to hammer the competition. Please note that these axles are designed for Tacx classic trainers only. Separate axles are available for its direct drive trainers which replace the standard axle skewer. Consult here for the appropriate axle configuration.