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 on the front wheel, there be a space between the tire and There is slight frictionBut I must inform you that due to the narrow 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 abilityThe shock absorption capacity of pneumatic tires is significantly that of solid tires, but if you do not pump air regularly, the inner tube be crushed by the outer tireColour:blackMaterial:rubberPackage Contents:2x inner tubeOnly 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.