Urban road tires on urban roads, and tire noise is low, so they are the quietest. These inner tubes are suitable for 10X/Speedual, if you install it on for /Grace 10, the rear is perfect, but when you install the tire and on the front , there will be a space between the tire and There is slight friction But I must inform you due to the narrow or the narrow swing arm, although the size of the pedal hub is suitable for the tire, such as for forDualtron 1/2, because there is not enough space for such a wide tire,for the track is 1/2 /3/4,for Inokin fast 1/2/3, but in fact they are not ! The installation and adjustment of tires require high hands-on ability The shock absorption capacity of pneumatic tires is significantly of solid tires, but if you do not pump regularly, the inner tube will be crushed by the outer tire Colour:black Material:rubber Package Contents: 2x inner tube Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.