Rapidfire Shifter doesn't return

[Bob Chambers]

I've set up a Deore LX rapidfire shifter/rear derailleur circa 91/92 - (groupset has biopace
chainrings) exactly as described by Barnets Chapter 3x
. All the shifts up to the large sprocket are perfect, but the shifter needs two clicks to
shift down to the next smallest sprocket, then gets confused when it reaches the smallest
sprocket - double shifts. Seems like the shifter isn't releasing. Anyone got a remedy. Chain
is stretched about
1/8" and pulleys appear worn. I'll be trying a new chain and pulleys when I can get to LBS.
--
Bob Chambers

 

[Gregr]

On Sun, 26 Jan 2003 21:17:46 +1100, "Bob Chambers" <[email protected]> wrote:

> I've set up a Deore LX rapidfire shifter/rear derailleur circa 91/92 - (groupset has biopace
> chainrings) exactly as described by Barnets Chapter 3x
>. All the shifts up to the large sprocket are perfect, but the shifter needs two clicks to
> shift down to the next smallest sprocket, then gets confused when it reaches the smallest
> sprocket - double shifts. Seems like the shifter isn't releasing. Anyone got a remedy. Chain
> is stretched about
>1/8" and pulleys appear worn. I'll be trying a new chain and pulleys when I can get to LBS.

Could be a lot of things.

Dirt in lever body - Juice it with WD40 real good. Sticky derailleur cablle - lube or replace Worn
guide pulley on RD - replace

G

 

[Matt O'Toole]

"GregR" <[email protected]> wrote in message news:[email protected]...
> On Sun, 26 Jan 2003 21:17:46 +1100, "Bob Chambers" <[email protected]> wrote:
>
> > I've set up a Deore LX rapidfire shifter/rear derailleur circa 91/92 -
> > (groupset has biopace chainrings) exactly as described by Barnets Chapter
3x
> >. All the shifts up to the large sprocket are perfect, but the shifter needs two clicks to shift
> > down to the next smallest sprocket, then gets confused when it reaches the smallest sprocket -
> > double shifts. Seems
like
> >the shifter isn't releasing. Anyone got a remedy. Chain is stretched
about
> >1/8" and pulleys appear worn. I'll be trying a new chain and pulleys
when I
> >can get to LBS.
>
> Could be a lot of things.
>
> Dirt in lever body - Juice it with WD40 real good. Sticky derailleur cablle - lube or replace Worn
> guide pulley on RD - replace

If it's not shifting to the smaller cogs, it's likely a sticky cable -- probably the last loop going
into the rear derailer. Lube the cable. If it doesn't get things working perfectly, replace that
piece of housing. It tends to fill up with dirt over time. Flushing it with WD40 before relubing
might help too.

Matt O.

 

[Dax]

"Matt O'Toole" <[email protected]> wrote in message
news:<[email protected]>...
> "GregR" <[email protected]> wrote in message news:[email protected]...
> > On Sun, 26 Jan 2003 21:17:46 +1100, "Bob Chambers" <[email protected]> wrote:
> >
> > > I've set up a Deore LX rapidfire shifter/rear derailleur circa 91/92 -
> > > (groupset has biopace chainrings) exactly as described by Barnets Chapter
> 3x
> > >. All the shifts up to the large sprocket are perfect, but the shifter needs two clicks to
> > > shift down to the next smallest sprocket, then gets confused when it reaches the smallest
> > > sprocket - double shifts. Seems
> like
> > >the shifter isn't releasing. Anyone got a remedy. Chain is stretched
> about
> > >1/8" and pulleys appear worn. I'll be trying a new chain and pulleys
> when I
> > >can get to LBS.
> >
> > Could be a lot of things.
> >
> > Dirt in lever body - Juice it with WD40 real good. Sticky derailleur cablle - lube or replace
> > Worn guide pulley on RD - replace
>
> If it's not shifting to the smaller cogs, it's likely a sticky cable -- probably the last loop
> going into the rear derailer. Lube the cable. If it doesn't get things working perfectly, replace
> that piece of housing. It tends to fill up with dirt over time. Flushing it with WD40 before
> relubing might help too.
>
> Matt O.

...in my experience: the arm carrying the smaller button has bent and is making it hang up on the
larger button - or on the grip, or on the brake lever. Good luck! Ъ×

 

[David Kunz]

Matt O'Toole wrote:
> "GregR" <[email protected]> wrote in message news:[email protected]...
>
>>On Sun, 26 Jan 2003 21:17:46 +1100, "Bob Chambers" <[email protected]> wrote:
>>
>>
>>>I've set up a Deore LX rapidfire shifter/rear derailleur circa 91/92 - (groupset has biopace
>>>chainrings) exactly as described by Barnets Chapter
>
> 3x
>
>>>. All the shifts up to the large sprocket are perfect, but the shifter needs two clicks to shift
>>> down to the next smallest sprocket, then gets confused when it reaches the smallest sprocket -
>>> double shifts. Seems
>
> like
>
>>>the shifter isn't releasing. Anyone got a remedy. Chain is stretched
>
> about
>
>>>1/8" and pulleys appear worn. I'll be trying a new chain and pulleys
>
> when I
>
>>>can get to LBS.
>>
>>Could be a lot of things.
>>
>>Dirt in lever body - Juice it with WD40 real good. Sticky derailleur cablle - lube or replace Worn
>>guide pulley on RD - replace
>
>
> If it's not shifting to the smaller cogs, it's likely a sticky cable -- probably the last loop
> going into the rear derailer. Lube the cable. If it doesn't get things working perfectly, replace
> that piece of housing. It tends to fill up with dirt over time. Flushing it with WD40 before
> relubing might help too.

IME any lube on the rear DR cable is too much and will make it shift slow / delayed. I've used LPS
to extend the life of a cable a couple of rides, but when mine do what you described, I replace the
cable AND the housing! I also use shimano cable seals to keep dirt out and I use teflon cable (YMMV,
but it works for me)...

David