Chain slip... what needs replaced?

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mrmacmusic

Veteran
Location
Tillicoultry
Since starting commuting last August, I've been weekly "mickling" my chain and doing general cleaning and lubrication to keep things running as smoothly as possible. My Ridgeback Flight 01 (2010 model) was bought new last August and I've covered approx 3000 miles on it now.

This week started well, however the past two days I've experienced some chain slip due, presumably, to wear. Fine cruising and climbing, however I got up on the pedals and gave it some beans to deal with some traffic, and the crank spun with a clunky whirring noise. First time it must've slipped only one or two teeth, but yesterday it spun through a good quarter turn :eek:

Thankfully, I didn't clobbered my bits on the top bar (!), nor did the chain snap, and I proceeded on my way – albeit a bit shaken. I obviously can't see what precisely is slipping at the time, but it sounded like the chainset rather than the cassette... having inspected both though, neither looks particularly worn, although it does look like the chain isn't meshing well around the whole chainring.

Given that I've done the miles I have, would it be wise to just replace the chain, or should I also think about replacing the cassette, chainring(s) and derailleur jockey wheels at the same time? Rear mech is Sora, chainset Shimano 2300 (32/42/52 and would really only need the 42t ring replaced given I spend such little time in the other rings!!) with an 8-speed 12-25 cassette, but I have no idea which chain I'd need :blush:

Currently I don't have any tools for removing the chain, chainset or cassette, so it's time to invest in these too. Rather than running to the LBS, I'd quite like to gain the experience of replacing the components as necessary myself, and would appreciate any advice on how to approach this, my first "major" service.
 

Pauluk

Senior Member
Location
Leicester
Have you measured the chain yet. You can either buy a tool for a few pounds or use a steel rule. That would be the first thing I would do, its simple and quick. from this you may be able to tell whether you need a new chain or a new chain and rear cogs. Look at youtube to see how to change chains, cassettes and chain rings. All fairly simple jobs. The chain is easy to replace, you just need a chain splitting tool (c £10) and a new chain. If the chain is very stretched you may be as well to change the rear cogs as well. Chains are supplied in different widths depending on how many cogs you have and they come in lengths that have to be reduced when you fit them.
 
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mrmacmusic

mrmacmusic

Veteran
Location
Tillicoultry
Have you measured the chain yet. You can either buy a tool for a few pounds or use a steel rule. That would be the first thing I would do, its simple and quick. from this you may be able to tell whether you need a new chain or a new chain and rear cogs. Look at youtube to see how to change chains, cassettes and chain rings. All fairly simple jobs. The chain is easy to replace, you just need a chain splitting tool (c £10) and a new chain. If the chain is very stretched you may be as well to change the rear cogs as well. Chains are supplied in different widths depending on how many cogs you have and they come in lengths that have to be reduced when you fit them.
Thanks Paul :thumbsup: It sounds like you don't think the chainring is likely to need replaced, only the chain and possibly the rear cassette too... can you define "very stretched" though?
 

Pauluk

Senior Member
Location
Leicester
The chain tools are usually set at .75 and 1.0. If its stretch all the way to 1 then people recommend changing the cassette as well. I'm not saying that the chainring doesn't need any attention but I would start with the chain, then the rear cassette then the chainring since I like to do things incrementally. Youtube videos will show you every thing you need to do when it comes to replacement, they are very good. In terms of chain size just but one that covers your cog number, in your case 8.
 

screenman

Squire
Come on guys the chain has done 3,000 miles that is a long way, I would not consider changing the chain without the cassette. As for the chainrings are they fish hooked?
 

simon.r

Person
Location
Nottingham
Definitey go down the chain / cassette route first, but it could also be that the freewheel is slipping. Worth being aware of in case it keeps happening after you've replaced the obvious bits.
 
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mrmacmusic

mrmacmusic

Veteran
Location
Tillicoultry
Can someone please confirm that this toolset does in fact include the tools I will need to remove and replace the chainset and rear cassette? It looks like it does, but I just wanted to be sure!

Having had a good look at the bike this morning there's definitely some wear on the rear cassette (although doesn't actually look like too much), whilst the teeth on my middle chain ring are definitely sharper than the other 2 add the dips between the teeth are more egg-shaped than round... from that, I'd surmise that I need a new chainring too :blush:
 

Andrew_P

In between here and there
Yup that will do the job, well I assume Shimano Cassette lock rings are all the same and it looks like the one in the kit is a Shimano one.

Just done this myself for the first time, you tube is defintiely your friend in splitting the chain and re-sizing the new one.

I chased down a jumping gear problem and mine was mainly at the bottom end, replaced loads of parts and it turned out to be the rear hanger had bent out of line slighty
 
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mrmacmusic

mrmacmusic

Veteran
Location
Tillicoultry
I've got a chain link extractor if you want to borrow it. I'm in Alva.
Thanks thnurg, appreciate the offer :thumbsup: – however I do really need to get my own toolkit put together.... I've clearly reached the point where weekly cleaning and lubing isn't sufficient!! It looks like that kit isn't too expensive and includes the basics?
 
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mrmacmusic

mrmacmusic

Veteran
Location
Tillicoultry
Yup that will do the job, well I assume Shimano Cassette lock rings are all the same and it looks like the one in the kit is a Shimano one.

Just done this myself for the first time, you tube is defintiely your friend in splitting the chain and re-sizing the new one.

I chased down a jumping gear problem and mine was mainly at the bottom end, replaced loads of parts and it turned out to be the rear hanger had bent out of line slighty
Thanks LOCO :thumbsup: Yeah, it looks right to me, and yes, I shall be consulting YouTube!
 
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mrmacmusic

mrmacmusic

Veteran
Location
Tillicoultry
Toolset, cassette and chain ordered –thanks folks :thumbsup: ...just need to find a 42T chainring now! Watching to see if ebay turns up anything.

Will be taking it easy commuting next week until the bits and pieces arrive... might even take the MTB :bicycle:
 
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