The upright bike shelf can be easily moved anywhere where the rear wheel can be kept ly in place with three V -shaped plastic parentheses. This parentheses not only prevent tire damage, but also can be adjusted to meet different tire dimensions. They form a solid triangular structure with SEATPOST. Makes the bike more stable. The bike shelf is made of high quality black powder coated steel, stable, durable, corrosion resistant and .Wide compatibility: The upright bike shelf sleeps all bicycle tire widths and sleeps with rubber rubber widths up to 3.9 inches. It can be used for ren's bikes, mountain bikes, road bikes. The maximum weight of the bike is 55 lbs/25 kg. The height of the lifting bar can be ly adjusted to provide the most suitable storage for bike. Unlike other bike shelves, this upright bike shelf avoids any hole or scratch on the wall, so the room always looks beautiful and regular. If you are looking for a steep bike shelf, this is your choice. It is perfect for small spaces such as corners and dormitories, apartments and offices.