The Conquer Indoor Bike Trainer is perfect for riding inside. This cycling trainer uses opposing magnets to create resistance and help you maintain a smooth, efficient pedal stroke. Conquer your fitness and cycling goals. Simple to assemble, no tools are necessary Made from durable hi-ten steel Extra wide frame provides maximum stability Easy to fold for storage Compatible with 26 in., 27 in. and 700c bikes with solid axle or quick release rear wheel. Not for use with bikes with wheels < 26 inches or > 27 inches. Rear wheel skewer is included (swap with quick release skewer on bike for trainer use) Skewer measures 7.5" long. If your bike's skewer is any longer, or if your bike has more than 10 gears on the rear cassette, this skewer (and the trainer) may not work for you. Included is a front wheel riser block which helps level the bike and keeps its front wheel stable