Sram pg820 8spd cassette the easy shifting cogs of this lightweight cassette offer strength and precise shifting while the power glide ii technology means the sram pg820 8spd cassette is both reliable and durable features regular black cog 8 speed cassette easy shifting power glide ii cogs gear ratio11 32 drilled cogs save a few grams sprocket material dura blast lock ring material steel speeds 8 speed recommended chain pc 38