* DOUBLE LOCK SYSTEM: The two knobs on the left and right of the stationary bike trainer construct the dual locking system, making it easily to lock your bike in place. For each part, one bigger knob outside and one smaller inside reinforce the locking mechanism. * STEADY, STABLE AND FIRM: The indoor exercise bike trainer is designed with dual-support structure. The wide frame and front wheel riser block keep it away from wobbling and reach unshakable balance. The steady base and adjustable anti-slip rubber feet fits for uneven floor in different conditions, preventing movement for stability on any surface. * SMOOTH IN SPIN: When riding a bike at home, a smooth bike exercise trainer is definitely necessary. Bike trainer with noise reduction resistance wheel makes your cycling virtually silent. BTW, if noise is loud, it has a lot to do with the materials and tread of bike tires. * FOLDABLE AND PORTABLE: After quick installation, you can begin to ride indoor. After exercise, you can take the bike off the trainer and fold the bike trainer easily. You may put it at any corner in your home, or carry it with you to another place. * COMPATIBLE WITH BIKES: The Unisky indoor bike trainer stand fits any road or mountain bike with a 26-28" or 700c wheel. There is no need to buy a new one if you have a road or mountain bike of normal size. Bring your bike inside and begin indoor cycling workout.