Derailleur help

[Helpme]

Hi all really need help last year my chain came off when changing gear, now derailleur won't come down if I pull it and let go it just shoots back up. Ive changed cable and chain but still won't come down. I've spent few hours messing but nothing help!!

 

[I like Skol]

Pictures or a video of the problem might help people understand the problem better.

Welcome to the forum, we will help as much as we can but you description is a little vague.

 

[shornby]

Hi all really need help last year my chain came off when changing gear, now derailleur won't come down if I pull it and let go it just shoots back up. Ive changed cable and chain but still won't come down. I've spent few hours messing but nothing help!!

 

[shornby]

Hi is the chain around the chain rings where it should be ?

 

[shornby]

if the chain is on the big chain ring and round the smallest sprocket --- the rear mech pulley wheels should be vertical -- if not the chain is the wrong length ------ if this is the case go onto GCN on you tube and watch a video on how to get the chain to the correct length

 

[Helpme]

Thanks for reply my bike is 11 speed the chain is correct length, I do all my own repairs but this has me beat

 

[Ajax Bay]

@Helpme

really need help last year my chain came off when changing gear, now derailleur won't come down if I pull it and let go it just shoots back up.

We can't envisage what the issue is, I think. Try to explain more clearly what you mean by 'derailleur won't come down'. Down where? Down to the smallest sprocket? Down to the largest sprocket?

Pictures or a video of the problem might help

It might but OP will not be able to post pictures (too new).

 

[I like Skol]

It might but OP will not be able to post pictures (too new).

can post links to vid footage

 

[shornby]

did you check on the spec of the rear Mech ? It just looks too short (ie a racing Mech) for such a large rear sprocket --- which really needs a long arm mech. Riding on the big chain ring and the biggest sprocket anyway i bad idea as the chain is at too great an angle ----

 

[Ajax Bay]

It just looks too short (ie a racing Mech) for such a large rear sprocket

What looks too short? Have you seen an image of the OP's drivetrain? Or was this comment meant for a different thread?
OP posted twice on Monday and has not been back to CycleChat to look since then. Suspect they've sorted it - and we'll never know what the problem was!