Deore LX rear derailleur

[John Redman]

When replacing the B tension screw spring, how do I put the correct tension on.

John R

[Pete Biggs]

John Redman wrote:
> When replacing the B tension screw spring, how do I put the correct tension on.

I take that as meaning: how to adjust the screw (please explain more if you mean something else) :

Shift chain to smallest front chainring and largest rear sprocket. From having the b-tension screw
undone all the way, turn it clockwise until the upper jockey wheel just stops causing significant*
rubbing/jamming against the sprocket.

* Sometimes it is not possible to completely eliminate rubbing in bottom gear. But shortening chain
by a link or two can help if necessary - that is when chain can afford to be shorter (it should
still be long enough for the largest chainring + largest sprocket).

more instructions:

1. http://sheldonbrown.com/derailer-adjustment.html

2. http://www.parktool.com/repair_help/FAQrindx.shtml
http://www.parktool.com/repair_help/FAQchainlength.shtml

3. http://www.shimano-europe.com/cycling

~PB

[John Redman]

No, I mean replacing the spring - it requires tensioning by turning the back plate before refitting
the circlip. It looks like a quarter turn as one and a quarter looks ni on impossible.

John R "Pete Biggs" <pbiggmellon{remove_fruit}s2000@onetel.net.uk> wrote in message
news:bljjdc$chco7$1@ID-144931.news.uni-berlin.de...
> John Redman wrote:
> > When replacing the B tension screw spring, how do I put the correct tension on.
>
> I take that as meaning: how to adjust the screw (please explain more if you mean something else) :
>
> Shift chain to smallest front chainring and largest rear sprocket. From having the b-tension screw
> undone all the way, turn it clockwise until the upper jockey wheel just stops causing significant*
> rubbing/jamming against the sprocket.
>
> * Sometimes it is not possible to completely eliminate rubbing in bottom gear. But shortening
> chain by a link or two can help if necessary - that is when chain can afford to be shorter (it
> should still be long enough for the largest chainring + largest sprocket).
>
> more instructions:
>
> 1. http://sheldonbrown.com/derailer-adjustment.html
>
> 2. http://www.parktool.com/repair_help/FAQrindx.shtml
> http://www.parktool.com/repair_help/FAQchainlength.shtml
>
> 3. http://www.shimano-europe.com/cycling
>
> ~PB

[Tony Raven]

John Redman wrote:
> No, I mean replacing the spring - it requires tensioning by turning the back plate before
> refitting the circlip. It looks like a quarter turn as one and a quarter looks ni on impossible.
>

If its the spring I am thinking of, that's the only bike maintenance job that I've given up on and
taken the bits to the shop. Even they struggled but managed it eventually.

Tony

--
"If you tell the truth you don't have to remember anything." Mark Twain