SRAM PG-970 12-23 9 Speed Cassette Size:12-23 They can then add material

They can then add material to areas of greater stress and fatigue to increase the long term strength and durability giving you

sort out minor mechanicals

About Shimano TZ500 14-34 7 Speed Multiple Freewheel CassetteThe SHIMANO TOURNEY TZ 7-speed freewheel features a MEGARANGE 14-28T range

more flexible and effective against cuts than a comparable nylon breaker

dual compound

SRAM PG-970 12-23 9 Speed Cassette Size:12-23 They can then add materialAbout SRAM PG 970 12 23 9 Speed Cassette Cassette technology optimized for MTB. More reliable. More durable. Better performing, thanks to an optimal tooth profile and shift ramp design for quick and positive index shifting. Go climb a mountain. Features SRAM's cassette performance is optimized by material choice, tooth profile and shift ramp design for quick and positive index shifting Narrow ratio cassette for the downhill fanatics in the crowd Steel