CG 39 SL Rear WheelThe CG 39 SL is an original purpose built gravel race wheelset, made for tackling any type of gravel, especially the steep stuff. As BMCs lightest carbon wheelset, you are sure to love who how this wheelset rides and races and it checks all the boxes on what you need in a great wheel fast, light and incredibly smooth. These wheels will make your legs feel like diamonds as you take on anything the gravel world can throw at them.