Shock absorption: Preventing the rebound no matter in rugged, bumpy, or rough roads and making your riding comfortable. Low wind resistance: Traditional bicycle rim always bring some uncertain volume of wind resistance when spinning. The bike will start decelerating immediately if you stop pedaling. Uni wheel is designed according to the centrifugal force and windmill theory. While riding, uni wheel will keep cycling and moving on even the pedaling stopped and not decelerates right away. When in riding, it will be faster, easier and also accelerate the speed. Various colors: Color your bike with more colors to choose from and more combinations To make. Size:26 x1.5 ~2.35(559x18) 24 x1.5 ~2.35(507x18) 24 x1(540x16) 24 x1 3/8(540x16) Material: Aluminum magnesium alloy Assembly: Bearing Axle: Front:3/8x100x140 nut type Rear:3/8x130x180 6sp freewheel nut type 3/8x135x185 7sp freewheel nut type 3/8x135x185 8sp freewheel nut type Color: Powder coating red, yellow, blue, black, white/