Help re gearchange - Shimano 105

[Ac]

Hi,

Can anyone help;

Problem: Shifting down (ie bigger cogs on backwheel)
sometimes takes more than 1 flick of the lever - chain is
moved out of alignment but not enough to move cogs. Usually
have to give a small second go, but if I move the lever too
much, it ends up causing a move up 2 gogs. Problem is
intermittent. No probs changing down

Only started a couple of weeks ago. Before that, all was
well

I started using Halfords General Purpose Cycle Maintenance
Spray to lubricate chain. This may be coincidence. Bike is
new (to me) but has done about 5.5k miles in

Any ideas? Its a real pain as everything was fine for the
first month of ownership

--
Cheers

AC

[Tony R]

"AC" <mitten@removenildram.co.uk> wrote in message
news:40cb5ad6$0$6329$65c69314@mercury.nildram.net...
> Hi,
>
> Can anyone help;
>
> Problem: Shifting down (ie bigger cogs on backwheel)
> sometimes takes
more
> than 1 flick of the lever - chain is moved out of
> alignment but not enough to move cogs. Usually have to
> give a small second go, but if I move the lever too much,
> it ends up causing a move up 2 gogs. Problem is
> intermittent. No probs changing down
>
> Only started a couple of weeks ago. Before that, all
> was well
>
> I started using Halfords General Purpose Cycle Maintenance
> Spray to lubricate chain. This may be coincidence. Bike is
> new (to me) but has done about 5.5k miles in
>
> Any ideas? Its a real pain as everything was fine for the
> first month of ownership
>
> --
> Cheers
>
> AC

First thing I'd try would be to have a fiddle with the
adjusting barrel on your derailleur. Maybe the tension on
your gear cable is too tight. Turn the barrel clockwise 1/4
turn at a time, testing the shifting after each 1/4, and see
if this helps.

tony R.

[Simonb]

tony R wrote:

> First thing I'd try would be to have a fiddle with the
> adjusting barrel on your derailleur. Maybe the tension on
> your gear cable is too tight. Turn the barrel clockwise
> 1/4 turn at a time, testing the shifting after each 1/4,
> and see if this helps.

Anti-clockwise, surely? OP is having probs shifting down.
Probably cable stretch.

[Tony R]

"tony R" <hesiod3@hotmail.com> wrote in message
news:ViJyc.2094$Z14.2134@news.indigo.ie...
>
> "AC" <mitten@removenildram.co.uk> wrote in message
> news:40cb5ad6$0$6329$65c69314@mercury.nildram.net...
> > Hi,
> >
> > Can anyone help;
> >
> > Problem: Shifting down (ie bigger cogs on backwheel)
> > sometimes takes
> more
> > than 1 flick of the lever - chain is moved out of
> > alignment but not
enough
> > to move cogs. Usually have to give a small second go,
> > but if I move the lever too much, it ends up causing a
> > move up 2 gogs. Problem is intermittent. No probs
> > changing down
> >
> > Only started a couple of weeks ago. Before that, all
> > was well
> >
> > I started using Halfords General Purpose Cycle
> > Maintenance Spray to lubricate chain. This may be
> > coincidence. Bike is new (to me) but has
done
> > about 5.5k miles in
> >
> > Any ideas? Its a real pain as everything was fine for
> > the first month of ownership
> >
> > --
> > Cheers
> >
> > AC
>
> First thing I'd try would be to have a fiddle with the
> adjusting barrel on your derailleur. Maybe the tension on
> your gear cable is too tight. Turn
the
> barrel clockwise 1/4 turn at a time, testing the shifting
> after each 1/4, and see if this helps.
>
Having just reread this I think I've got it **** about face.
You mean the problem occurs when moving from smaller to
larger sprockets don't you? In this case the tension might
be too loose and you need to do the adjusting anti-
clockwise........I think. Ooops,

tony R.

[Tony R]

"Simonb" <sbennett@YOUAREALLHEATHENSwiderworld.co.uk> wrote in message
news:40cb6288$0$58821$5a6aecb4@news.aaisp.net.uk...
> tony R wrote:
>
> > First thing I'd try would be to have a fiddle with the
> > adjusting barrel on your derailleur. Maybe the tension
> > on your gear cable is too tight. Turn the barrel
> > clockwise 1/4 turn at a time, testing the shifting after
> > each 1/4, and see if this helps.
>
> Anti-clockwise, surely? OP is having probs shifting down.
> Probably cable stretch.

You beat me to it...

tony R.