The Conquer Indoor Bike Trainer is perfect for riding inside. This cycling trainer uses opposing magnets to create resistance and help maintain a smooth, efficient pedal stroke. Simple to adjust with easy to grasp wingnuts, the Conquer bike trainer has sturdy mounting cups that can accommodate axles up to 8.5" wide (either quick release or through axles) and will work with bikes that have 26", 27" and 700c wheels. Easy to use and portable enough to set up anywhere you want to train indoors. The elements and shorter winter nights are no longer barriers to exercise with a Conquer Indoor Bike Trainer Portable Exercise Bicycle Magnetic Stand.