Cycling Front Wheel Riser Block: When using a bike trainer, it will raise the rear wheels creating an unbalanced position that is not suitable for long-term riding exercise.The wheel riser block cycling front can lift the front wheel of the bicycle to maintain a natural riding posture. Wide application: Wheel Riser Block Bike Trainer Suitable for most road and mountain bikes, which can keep the bike stable and upright for better cycling training. Premium Material: Our bicycle front wheel rest is made of sturdy, durable and lightweight molded plastic. These pads on the bottom can prevent damage to the floor. Bike accessory: the center groove of the front wheel of the is used for road bikes and the outer groove for mountain bike wheels, one can be used to match multiple bikes. Safety: The shape of the stabilizer structure of the bike front wheel mounting block improves stability and safety. It helps to keep your bike's front tire in place. Note: The data is all manual measurement , please allow 1 - 3cm error, due to the light and display difference, there will be some color difference, depending on the physical object received.