New Chain Woes

Grimbly said:

Hi all,

Just had a new chain fitted. The indexing worked fine before, but now the chain's slipping on the
rear cassette.

Is this an indexing issue, or should I start saving for a new cassette ?

I've used EXACTLY the same make and model of chain as the old one, 8 Speed SRAM PC58 to be
precise.

Check the teeth on the cassette. Do the ones on the most used sprockets look the same as the (rarely
used) smallest one? If they're noticeably thinner in profile, you need a new cassette.

Grimbly said:

Just had a new chain fitted. The indexing worked fine before, but now the chain's slipping on the
rear cassette.

Is this an indexing issue, or should I start saving for a new cassette ?

Only indexing if it's not staying in or changing gear properly.

Quoted message said:

I've used EXACTLY the same make and model of chain as the old one, 8 Speed SRAM PC58 to be
precise.

First check for stiff links - by watching chain as it's run backwards over the sprockets or by
rotating each link manually.

Then I would suspect cassette is too worn for a new chain. How many miles done on old chain?

Some people reckon you can sometimes bed a skipping chain in, but I think it's best to get a new
cassette (or just replace individual sprockets if possible) ASAP. Alternatively, bung the old chain
back on if you don't mind wearing out the chainrings.

There is a small chance the chain is skipping on chainrings - can feel similar.

~PB

Grimbly wrote in message ...

Quoted message said:

Just had a new chain fitted. The indexing worked fine before, but now the chain's slipping on the
rear cassette.

I bet they put a longer chain on, so the tension has gone slack :~(

Your chain is probably a bit longer than the last one. There is a way of
working out the optimum length which your shop should know
Rob N
"Grimbly" <grimbly@____btinternet___.com> wrote in message
"]news:[email hidden]...

Quoted message said:

Hi all,

Just had a new chain fitted. The indexing worked fine before, but now the chain's slipping on the
rear cassette.

Is this an indexing issue, or should I start saving for a new cassette ?

I've used EXACTLY the same make and model of chain as the old one, 8 Speed SRAM PC58 to be
precise.

Any ideas ?

Thanks in advance.

"Grimbly" <grimbly@____btinternet___.com> wrote in message
"]news:[email hidden]...

Quoted message said:

Hi all,

Just had a new chain fitted. The indexing worked fine before, but now the chain's slipping on the
rear cassette.

Is this an indexing issue, or should I start saving for a new cassette ?

The old chain was too worn, so the cassette matches it and a new chain will slip. Yes, you need a
new cassette.

To avoid this problem in the future, replace the chain before it's too worn out - determined by
measuring the length of 12 links. (replace when they're 12 1/16"😉.

Here's a link to the definitive article on this subject:

sheldonbrown.comchains.htmlOpen ↗

cheers, clive

I've had the same thing happen. The cassette was worn out. Pete gives good advice above.

Quoted message said:

Your chain is probably a bit longer than the last one. There is a way of working out the optimum
length which your shop should know Rob N "Grimbly" <grimbly@____btinternet___.com> wrote in message
"]news:[email hidden]...

Quoted message said:

Hi all,

Just had a new chain fitted. The indexing worked fine before, but now the chain's slipping on the
rear cassette.

Is this an indexing issue, or should I start saving for a new cassette ?

I've used EXACTLY the same make and model of chain as the old one, 8 Speed SRAM PC58 to be
precise.

Any ideas ?

Thanks in advance.

Robin Norton said:

Your chain is probably a bit longer than the last one.

The rear derailleur automatically tensions the chain so it would have to be /much/ longer before
anything nasty happened in most of the gears - and that's very unlikely.

- If chain is not staying in gear then the cable might need adjusting.
- If chain is is skipping over sprocket teeth, most likely the chain is too fresh for the cassette:
a classic common problem.

To add to my previous reply, another solution (if cassette is not highly knackerd) can be to try a
different brand of chain beacuse the amount of play or "stretch" (and other factors?) actually
varies even with new chains (though it's not strictly supposed to). I've found a new SRAM PC59
worked on a used cassette after first trying a new Campagnolo C9 that skipped. I don't know if you'd
be lucky enough to find this difference with other brands as well.

Quoted message said:

There is a way of working out the optimum length which your shop should know

www.parktool.com/repair_help/FAQchainlength.shtml

~PB

On Sat, 10 Jan 2004 11:55:13 -0000, "Clive George"

Quoted message said:

"Grimbly" <grimbly@____btinternet___.com> wrote in message
"]news:[email hidden]...

Quoted message said:

Hi all,

Just had a new chain fitted. The indexing worked fine before, but now the chain's slipping on the
rear cassette.

Is this an indexing issue, or should I start saving for a new cassette ?

The old chain was too worn, so the cassette matches it and a new chain will slip. Yes, you need a
new cassette.

To avoid this problem in the future, replace the chain before it's too worn out - determined by
measuring the length of 12 links. (replace when they're 12 1/16"😉.

Now here's a thing. I have a nice steel rule with mm on one edge and inches on the other. The inches
stop at 12. How can I measure 12
1/16" ?

Quoted message said:

Here's a link to the definitive article on this subject:

And if you get enough links you can join them up so you won't need to buy a new chain.

Tim
--
Blue Witch laughed at me

Quoted message said:

"Grimbly" <grimbly@____btinternet___.com> wrote in message
"]news:[email hidden]...

Quoted message said:

Hi all,

Just had a new chain fitted. The indexing worked fine before, but now the chain's slipping on
the rear cassette.

Is this an indexing issue, or should I start saving for a new cassette ?

The old chain was too worn, so the cassette matches it and a new chain will slip. Yes, you need a
new cassette.

To avoid this problem in the future, replace the chain before it's too worn out - determined by
measuring the length of 12 links. (replace when they're 12 1/16"😉.

Here's a link to the definitive article on this subject:

sheldonbrown.comchains.htmlOpen ↗

cheers, clive

Manufacturers say 1% 'stretch' which is 12 1/8 by my reckoning. Have I made some kind of error?

Pete Biggs said:

Robin Norton said:

Your chain is probably a bit longer than the last one.

The rear derailleur automatically tensions the chain so it would have to be /much/ longer before
anything nasty happened in most of the gears - and that's very unlikely.

I remember once changing a chain in a rush and forgot to chop it to length. The gears jumped like
the OPs, there were four or five excess links. I have saved most of these over the years and have
about 10 inches of new chain so far ! I also have several used chains, not worn out as I change my
chains well before they get worn out and thus eliminate the need to change the cassette, has anyone
any interesting ideas what I could do with a part used chains. I'm thinking of novelty decorations
for my garage or something

Michael Green said:

Manufacturers say 1% 'stretch' which is 12 1/8 by my reckoning. Have I made some kind of error?

What do manufacturers say about the 1% stretch and are they right?

~PB

MSeries said:

Pete Biggs said:

Robin Norton said:

Your chain is probably a bit longer than the last one.

The rear derailleur automatically tensions the chain so it would have to be /much/ longer before
anything nasty happened in most of the gears - and that's very unlikely.

I remember once changing a chain in a rush and forgot to chop it to length. The gears jumped like
the OPs, there were four or five excess links. I have saved most of these over the years and have
about 10 inches of new chain so far ! I also have several used chains, not worn out as I change my
chains well before they get worn out and thus eliminate the need to change the cassette, has
anyone any interesting ideas what I could do with a part used chains. I'm thinking of novelty
decorations for my garage or something

I use an old cassette as a paperweight if thats any help.

Sam Salt

---
Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (grisoft.comgrisoft.comOpen ↗).
Version: 6.0.560 / Virus Database: 352 - Release Date: 08/01/2004

MSeries said:

Pete Biggs said:

The rear derailleur automatically tensions the chain so it would have to be /much/ longer before
anything nasty happened in most of the gears - and that's very unlikely.

I remember once changing a chain in a rush and forgot to chop it to length. The gears jumped like
the OPs, there were four or five excess links.

I suppose five extra links counts as "much" longer.

~PB

Yup - 'twas the Cassette.

Put the old chain on, no problems.

Got a new Cassette from Halfords...

Thanks for all you help.

Sam Salt said:

Quoted message said:

eliminate the need to change the cassette, has anyone any interesting ideas what I could do with
a part used chains. I'm thinking of novelty decorations for my garage or something

Make a new brand of chainwhip.
--
I remember when the internet was only in black & white. It only had a few pages but at least they
all worked. Email: Put only the word "richard" before the @ sign.

"Pete Biggs" <[email hidden]> wrote in message
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Quoted message said:

Michael Green said:

Manufacturers say 1% 'stretch' which is 12 1/8 by my reckoning. Have I made some kind of error?

What do manufacturers say about the 1% stretch and are they right?

~PB

My experience is that 1% is far too much. 1/2% or 1/16" is maximum. Hjalmar