City tires perform well on city roads, and the tire noise is low, so they are the quietest. These inner tubes are suitable for Zero 10X/Speedual, if you install them on Zero/Grace 10, the rear wheel is perfect, but when you install the tire and fender on the front wheel, there will be a gap between the tire and the fender. There is slight friction. But I must inform you that due to the narrow fender or narrow swingarm, even if the size of the pedal wheel hub is suitable for the tire, as for Dualtron 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! Installation and adjustment of tires require high practical ability. The shock absorption capacity of pneumatic tires is significantly better than solid tires, but if you do not pump air regularly, the inner tube will be crushed by the outer tire. Color: 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 allowed measurement error is +/- 1-3 cm.