11 speed derailleur

[cycleman]

I have been having troubles with my  11 speed system on the  tricon gr. I am running it friction on 10 speed derailleur. It has jumped and very occasionally skipped on the 51 tooth Sprocket..I noticed that the  chain appears loose on the 51 Sprocket despite the derailleur b screw and tension arm appearing to be set up fine. My tame mechanic at the cycle shop has said that the 11 system has a lot of tension in it which he feels contributes to fast  chain wear. I  wonder if I bought a expensive 11 speed derailleur it would have a stronger spring and solve the problem. If its  :)unlikely to work I can just lock the Sprocket out.( as I have been doing so far).
Any thoughts from the Yacf hive mind?

[Asterix, the former Gaul.]

I'd love to help, but I haven't got to 10 speed yet.   

[cycleman]

I've just locked out the 51" Sprocket for now. Thanks for the thought. I still think 9 speed should be enough but I  need ultra low gears on the trike this days 

[Woofage]

Sorry I can't offer any help, but my mind boggles at the thought of a 51 tooth cassette  . I have a 40T on one of my bikes and I thought that was mahoosive enough  .

[T42]

51 inch. Never used that system so have no idea what it works out at in teeth.

[Kim]

Sorry I can't offer any help, but my mind boggles at the thought of a 51 tooth cassette 

Yes, from watching the drivetrain in action, at least part of the problem appears to be that the chain is occasionally jumping off the *top* (ie. drive-side) of the sprocket slightly early, when one of the shaped teeth reaches the relevant position.  As this is the drive side, it seems to me that this is a sprocket/chainline issue, rather than a derailleur issue.

[cycleman]

I have noticed that the chain doesn't sit tight on the 51 as if it was a very worn chain (it's nearly new) hence my chain tension query re 11 speed derailleur systems   

[FifeingEejit]

I can't work out your set up from the description.

Is it 1x11 with a 51-12 or similar cassette, or is it 2x11 with a big ring of 51?

I'm suspecting the former though.

11x is quite finicky about tuning, it may just be you need the top stop a nudge further up, and before you know it you've adjusted it enough that you've got 6 broken spokes and a walk home...

[cycleman]

44 34 22 on the front 

[Kim]

To clarify, it's a triple chainset with a dinner-plate MTB cassette.  On a tadpole recumbent trike where the drive-side chain passes under an idler pulley somewhere under the seat to keep things in line with the suspension pivot.  Which means that what's going on at the front has no effect on chainline, but also that the chain angle is determined by the distance between the cassette and idler, which is approximately the same as you'd get on a DF bike - you don't get the shallow angles afforded by some recumbent drivetrains.