The sram pg 1050 10 speed cassette the new powerglide 1050 cassette offers an innovative approach to 10 speed cassette design sram39s cassette performance is optimized by material choice tooth profile and shift ramp design for quick and positive index shifting the cassette shifts efficiently and positively in all high performance situations sram39s new cassette features a semi spidered construction for a maximum stiffness to weight ratio and is available in many optimized co