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    Play in cassette but only on the middle cogs?

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    10 Comments

    1. brightfff on

      Most Shimano cassettes are multi-piece, compared with SRAM that are usually a single unit. Shimano lumps together the lowest gears, then a chunk in the middle, and then the bottom few high gears are individual cogs (and some spacers) as you get closer to the lock ring.

      You could remove it, clean everything and reinstall, making sure to torque it appropriately. Check for wear on the splines of the freehub body and inside of the cassette mounting teeth.

    2. Ultimate_disaster on

      Be sure the last part of the cassette with the small cogs are in the correct position on the freehub (it sits on the correct notch) and tighten the lock ring with the 40Nm.

      When the last small cog is on a wrong position you don’t tighten the whole cassette with the 40Nm and you can move the middle parts.

    4. UserUnfriendly_0xFF on

      Is there a chance the spline is notched from use (combined with the separate sections of the cassette)?

      I’ve worked on bikes with hard time that had significant wear-damage to that spline shaft (The cassette steel is much harder than the aluminum spline body.)

    5. Business-Pattern-807 on

      It’s a common problem with M5100 cassettes. You need to check torque more often to be sure that’s firm enough. This is a reason why I change my drivetrain from Shimano to Microshift Advent X

    8. 1MTBRider on

      I had this same problem. You need a lock ring washer. They should come from factory but they rarely are there. Of course like the others said double check the install. I would do the same, torque it down at 40NM and it would be fixed. Hang the bike up, come back the next day and the cassette was loose again.

      Edit: I spoke with my LBS and had the part ordered it was $2 or so. Expensive for a thin piece of aluminum. They were saying that out of every 10 cassettes they come with a washer in maybe 2 or 3 of them.

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