In smallest chainring both front and back. Derailleur used to hold tension but after dis- and reassembly from frame it doesn’t. What do I need to do?
Rear derailleur doesn’t hold tension on chain
byu/Guzinero inbikewrench
by Guzinero
In smallest chainring both front and back. Derailleur used to hold tension but after dis- and reassembly from frame it doesn’t. What do I need to do?
Rear derailleur doesn’t hold tension on chain
byu/Guzinero inbikewrench
by Guzinero
11 Comments
Is b screw missing?
i shouldn’t move from that point like that i think you instal it wrong. did you get guides?
feels like hanger screw needs tightening
Look how loose is cable… u can see it.
Is your cage stuck? Your cage has zero tension
The derailleur cage has a spring wrapped around its pivot point with an end that goes into a tiny hole on the derailleur body. The spring has popped out of the hole, so that the derailleur cage is no longer spring loaded. Take off the cage, resituate the spring, and you should be good.
Something in the main pivot is stuck. Where the lower cage rotates. The lower pully should spring towards the back of the bike
Incorrect installing. B screw is not set correctly.
Chain is too long. You need to shorten a new chain.
This thread is a prime example of why seeking information on a chat room is pointless.
The rear mech tensioning arm is not working correctly. This should be sprung and will pivot back to tension the chain as shown here, but this is not happening:
https://i.imgur.com/7MHTUOc.png
You need to resolve this, but ultimately it’s a failure of the derailleur in some way. Perhaps jammed, perhaps broken spring, perhaps not assembled correctly, but the fault definitely lies here.