Sram pg850 8 speed road cassetteif youre a rider whose performance needs or riding style dictates that you run an 8 or 9 speed drivetrain the powerglide 850 is your only choice for light weight strength and precise shifting recommended group pc68 pc58 pc48ring sizes 12 to 23 or 12 to 26 8 speedweight 240g 12 26tbuy sram components from chain reaction cycles the worlds largest online bike store