Slipping chain- can you ever just replace one part of the chaindrive?

[spindrift]

I kept my old chain and just replaced the rear mech, now I've got a
slipping chain, it rarely actually slips a cog, but there's definitely
some give, the cog seems to slip really slightly. New chain? Thanks in
advance.

 

[Marz]

On Feb 11, 11:13 am, spindrift <[email protected]> wrote:
> I kept my old chain and just replaced the rear mech, now I've got a
> slipping chain, it rarely actually slips a cog, but there's definitely
> some give, the cog seems to slip really slightly. New chain? Thanks in
> advance.

You replaced your rear derailleur or cog set? What do mean by mech?

If you mean derailleur, then you may need to adjust cable tension to
bring the jockey wheels in line with the gear you expect to be in. Has
gear shifting been affected?

If you mean cog set (or cassette), then yes, I'm guessing a new chain.
I've never been able to just replace a cogset without fitting a new
chain. My ratio of chain replacement to cogset is 3:1.

 

[spindrift]

On 11 Feb, 17:23, Marz <[email protected]> wrote:
> On Feb 11, 11:13 am, spindrift <[email protected]> wrote:
>
> > I kept my old chain and just replaced the rear mech, now I've got a
> > slipping chain, it rarely actually slips a cog, but there's definitely
> > some give, the cog seems to slip really slightly. New chain? Thanks in
> > advance.
>
> You replaced your rear derailleur or cog set? What do mean by mech?
>
> If you mean derailleur, then you may need to adjust cable tension to
> bring the jockey wheels in line with the gear you expect to be in. Has
> gear shifting been affected?
>
> If you mean cog set (or cassette), then yes, I'm guessing a new chain.
> I've never been able to just replace a cogset without fitting a new
> chain. My ratio of chain replacement to cogset is 3:1.

Yeah, sorry, I meant cog set.

Blast.

 

[Pete Biggs]

spindrift wrote:
> I kept my old chain and just replaced the rear mech, now I've got a
> slipping chain, it rarely actually slips a cog, but there's definitely
> some give, the cog seems to slip really slightly. New chain? Thanks in
> advance.

You don't need a new chain or new anything else when replacing a derailleur.

Probably the cable tension isn't quite right. Have a fiddle.

~PB

 

[Zog The Undeniable]

spindrift wrote:
> I kept my old chain and just replaced the rear mech, now I've got a
> slipping chain, it rarely actually slips a cog, but there's definitely
> some give, the cog seems to slip really slightly. New chain? Thanks in
> advance.

If you change your chain when it gets to 12 1/16" for 24 links, you can
re-use everything else. You should get through three chains or more per
cassette and a lot of chains per chainring.

 

[Pete Biggs]

spindrift wrote:

> Yeah, sorry, I meant cog set.

So you replaced the cog set (aka cassette)?

It's not necessary to replace the chain at the same time if it is hardly
worn, otherwise it is wise to.

Skipping with a new cassette is a sign that the chain is too worn.

~PB

 

[spindrift]

On 11 Feb, 17:39, Zog The Undeniable <[email protected]> wrote:
> spindrift wrote:
> > I kept my old chain and just replaced the rear mech, now I've got a
> > slipping chain, it rarely actually slips a cog, but there's definitely
> > some give, the cog seems to slip really slightly. New chain? Thanks in
> > advance.
>
> If you change your chain when it gets to 12 1/16" for 24 links, you can
> re-use everything else.  You should get through three chains or more per
> cassette and a lot of chains per chainring.

Chain's a year old, has done about 2000 miles, some off road.

 

[Zog The Undeniable]

spindrift wrote:

> Chain's a year old, has done about 2000 miles, some off road.

Clean it, let it hang freely and measure it with an accurate steel rule.
500 miles is enough to "stretch" a chain in heavy off-road use.