Urban road tires perform well on urban roads, and tire noise is low, so they are the quietest. These inner tubes are suitable for Zero 10X/Speedual, if you install it on for Zero/Grace 10, the rear wheel is perfect, but when you install the tire and fender on the front wheel, there will be a space between the tire and fender There is slight friction But I must inform you that due to the narrow fender or the narrow swing arm, although the size of the pedal wheel 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 compatible The installation and adjustment of tires require high hands-on ability The shock absorption capacity of pneumatic tires is significantly better than that of solid tires, but if you do not pump air 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 cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.