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I have a fairly old Shimano RD-M8000 with which it becomes increasingly hard to shift gears when the clutch is activated. Particularly the mid-range gears are hard to shift into, the very low and very high gears are fairly ok. The force I have to apply is extremely high (and I figure it cannot be good for the mechanics).

What could be the reason for this? Shifter cable/tube is brand new, and shifting is smooth without the clutch activated.

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    The clutch needs servicing. It’s an easy procedure, and the instructions are available under the RD-M8000 service manual.
    – MaplePanda
    Mar 7 at 8:14
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    Note a mild case of difficult-to-change gears is expected with even a new working rear derailleur. It's supposed to require slightly more force to change the gears.
    – juhist
    Mar 7 at 8:52
  • Thanks for the advice, I will service the clutch.
    – PejoPhylo
    Mar 7 at 21:57

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