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My 10 speed deore derailleur has stopped shifting into two smallest cogs, even with the cable tension completely backed off
Can you manually push it into the correct position? That eliminates the question of a hard stop (limit screw, frayed cable) and leaves a weak spring as the culprit. It shouldn't happen in the 21st Century, what with metallurgy being so good in general, but we used to avoid storing bikes with the rear dérailleur in the low gear position to avoid the return spring taking a set and getting slow at the top end.
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I can't think of anything besides a bent derailleur hanger, unless someone has been messing with your limit screws. Or some very specific failure in your shifter.
To check the hanger:
- Shift into a larger sprocket on the cassette.
- Stand behind the bike and look at the cage from the rear.
- Does it hang straight down or does it point in towards the spokes?
If you don't have a derailleur alignment gauge then then you can use a long 5mm allen key in the derailleur bolt (where it clamps to the hanger).
- Shift into a larger sprocket on the cassette.
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gbj_tester
Ndeipi
@JamesQGM
Strange one. My 10 speed deore derailleur has stopped shifting into two smallest cogs, even with the cable tension completely backed off.
Any explanation other than the derailleur has got bent? It's on my MTB which gets bashed about a bit in cars/the shed