1、4 Different Heights: There are 4 heights of the bicycle front wheel fixation, 85mm/3.3in, 70mm/2.8in, 60mm2.4in, 50mm/2.0in, which can meet the needs of different slope 2、Prevent Injuries: Uses an embedded anti skid adhesive design, which greatly guarantees the stability of the cycling. 3、Useful Tool: Suitable for indoor bicycle training, it can raise the front wheel, keep the bicycle fluently straight with a better training effect. 4、Strong Material: Adopted PC + ABS material, that the riser block is sturdy, high strength, wear resistant, suitable for long term use. 5、Easy to Use: Bike wheel riser block supports quick release that you will not get stuck during use, the weight will make the riser block more stable. Item Type: Bicycle Front Wheel Riser Material: PC + ABS Application: for Indoor Bicycle Training Product Size: Approx.240x115mm/9.4x4.5in Height: 85mm/3.3in, 70mm/2.8in, 60mm2.4in, 50mm/2.0in (Manual measurement, allowing 1-2cm error) Weight: Approx.600g/21.2oz 1 x Bicycle Front Wheel Riser