Why we need bike riding platform stable? When riding indoors, because the riding platform will raise the rear wheel, the horizontal angle of the bicycles is adjusted to the rear wheel high and the front wheel low, which is not suitable for long-term riding exercises, thus we need some bike front wheel riser blocks to keep the riding platform stable. Features -Color:Assorted Color -Material:Plastic ,steel -Size:22.50X11.50X5.50cm/8.84X4.52X2.16in -Raising the front wheel during riding exercise can maintain a posture and protect the human spine. -Suitable for most road and mountain bikes, one can be used to match multiple bikes. -The front wheel pad of the riding platform is equipped with stable base, which effectively improves stability and safety during riding. -Convenient to carry: The product is lightweight and portable, easy to carry and install, suitable for indoor and outdoor cycling training. -This riding platform accessory will help keep your bike you train inside or outside. Package list: 1 x Bike Front Wheel Riser Block 1 x Pole