The sram pg 1070 10 speed cassette recommended for use with sram39s force and rival groupsets the new powerglidetrade 1070 cassette offers an innovative approach to 10 speed cassette design sram39s cassette performance is optimized by tooth profile and shift ramp design for quick and positive index shifting the cassette shifts efficiently and positively in all high performance situations there new cassette features a semi spidered construction for a maximum stiffness to weight