THIS grinds my gears......

[silva]

Here is a good picture of the normal evenly distribution of the wear:
https://www.durochains.com/roller-chain-wear-s/154.htm

Pin wear should be even on the entire circumference in an ideal scenario.

If wear DOES concentrate, it has a specific reason, such as dirt/sand getting there, oil not getting there, chainline not straight, ...

 

[JonBuoy]

Here is a good picture of the normal evenly distribution of the wear:
https://www.durochains.com/roller-chain-wear-s/154.htm

View attachment 805155
If wear DOES concentrate, it has a specific reason, such as dirt/sand getting there, oil not getting there, chainline not straight, ...

That pin looks to me like it is from a bushed chain. As far as I am aware most, if not all, bike chains are now bushingless.

 

[matticus]

It's important though, since correct terminology helps understanding.
The word suggests that link plates become longer, they don't,

"the chain stretched" suggests that the chain got longer. Anything else is in your mind! ;-)

[can you tell how this knowledge of pins and internal wear helps a cyclist maintain their drivetrain? I think increased wear from a worn chain cannot be prevented by knowing how the chain is made, or which bit wears. Convince me otherwise!]

 

[Dogtrousers]

What is the difference between elongated and stretched.

I think the stretch/elongate distinction is a nonsense bit of faux pedantry. It just means it has got longer. Common usage of stretch. No problem. Cats stretch, clothes stretch, arms, legs, budgets, even periods of time can be stretched, so why not chains?

The underlying engineering of why is interesting. If not of a great deal of practical use

 

[Ajax Bay]

With regard to pedantry I offer you this.
"Stretch" implies elastic strain caused by tension (force/stress), returning to one inch per link when the tension eases. Whereas "elongate" describes the outcome: a longer chain overall.
Using the latter word mitigates the risk (with undescribable consequences) of cyclists thinking that the sideplates themselves stretch inelastically.

I think the stretch/elongate distinction is a nonsense bit of faux pedantry. It just means it has got longer. Common usage of stretch. No problem. Cats stretch, clothes stretch, arms, legs, budgets, even periods of time can be stretched, so why not chains?

Cats, arms, legs stretch elastically and return to 'norm'. Clothes stretch because their fibres stretch inelastically in two/three dimensions. I leave you to grapple with budgets - but I suggest they break but people pretend they 'stretch'. Carry on.

 

[Dogtrousers]

With regard to pedantry I offer you this.
"Stretch" implies elastic strain caused by tension (force/stress), returning to one inch per link when the tension eases. Whereas "elongate" describes the outcome: a longer chain overall.
Using the latter word mitigates the risk (with undescribable consequences) of cyclists thinking that the sideplates themselves stretch inelastically.

Cats, arms, legs stretch elastically and return to 'norm'. Clothes stretch because their fibres stretch inelastically in two/three dimensions. I leave you to grapple with budgets - but I suggest they break but people pretend they 'stretch'. Carry on.

I think common usage is somewhat more elastic than that.

 

[Webbo2]

With regard to pedantry I offer you this.
"Stretch" implies elastic strain caused by tension (force/stress), returning to one inch per link when the tension eases. Whereas "elongate" describes the outcome: a longer chain overall.
Using the latter word mitigates the risk (with undescribable consequences) of cyclists thinking that the sideplates themselves stretch inelastically.

Cats, arms, legs stretch elastically and return to 'norm'. Clothes stretch because their fibres stretch inelastically in two/three dimensions. I leave you to grapple with budgets - but I suggest they break but people pretend they 'stretch'. Carry on.

I’m still no clearer to what’s going on with chains. Should I just grind off the teeth on the cassette and use a motor bike chain aka Silva in the square taper thread?

 

[Alex321]

I’m still no clearer to what’s going on with chains. Should I just grind off the teeth on the cassette and use a motor bike chain aka Silva in the square taper thread?

I wouldn't do anything Silva suggests TBH, without some other source suggesting it as well.

They very rarely agree with orthodox thought, and in most cases where there is an orthodoxy relating to bikes, there is very good reason for it.

 

[Webbo2]

I wouldn't do anything Silva suggests TBH, without some other source suggesting it as well.

They very rarely agree with orthodox thought, and in most cases where there is an orthodoxy relating to bikes, there is very good reason for it.

I was taking the wee, wee,I should have put a 🫣or the like to finish. Sorry.

 

[matticus]

I think common usage is somewhat more elastic than that.

Key words! I genuinely applaud Mr Ajax' pedantry, but it is heavily skewed to the lesser known engineering definition.

If I look on t' internet, 2 out of 5 meanings refer to increasing length permanently - totally not what Ajax is describing:

stretch

verb
1. (of something soft or elastic) be made or be capable of being made longer or wider without tearing or breaking.
my jumper stretched in the wash
2. cause (something) to become longer or wider by pulling it.
stretch the elastic
3. straighten or extend one's body or a part of one's body to its full length, typically so as to tighten one's muscles or in order to reach something.
the cat yawned and stretched
4. extend or spread over an area or period of time.
the beach stretches for over four miles
5. last or cause to last longer than expected.
her nap had stretched to two hours

 

[Sea of vapours]

Key words! I genuinely applaud Mr Ajax' pedantry, but it is heavily skewed to the lesser known engineering definition.

Hmmm.... I would argue, indeed do, that not one of those five definitions describes what a chain does in order to elongate :-)

To avoid tedium, I won't list why each one is 'not true for a bicycle chain', but they're not, so you've considerably strengthened @Ajax Bay 's point here, showing that 'stretch' is emphatically not the correct term, as distinct from being a 'lesser known engineering definition' of what a chain does to elongate.

Still, it's tricky to not say 'stretch', I find ... It seems more natural :-)

 

[Alex321]

Hmmm.... I would argue, indeed do, that not one of those five definitions describes what a chain does in order to elongate :-)

To avoid tedium, I won't list why each one is 'not true for a bicycle chain', but they're not, so you've considerably strengthened @Ajax Bay 's point here, showing that 'stretch' is emphatically not the correct term, as distinct from being a 'lesser known engineering definition' of what a chain does to elongate.

Still, it's tricky to not say 'stretch', I find ... It seems more natural :-)

I think definition 4 just about applies - extend or spread over a period of time.

It is extending over time.

 

[matticus]

One might also question why some posters use the term "elongate" when they could say "get longer" ...

 

[Alex321]

One might also question why some posters use the term "elongate" when they could say "get longer" ...

It is two characters fewer to type

 

[Sea of vapours]

I think definition 4 just about applies - extend or spread over a period of time.

Just about, yes. It's certainly the closest.

One might also question why some posters use the term "elongate" when they could say "get longer" ...

As well as being two characters fewer to type, as @Alex321 points out, it's a precise word and thus more pleasing than a pair of words. Plus, 'get' is horrible in nearly all circumstances, so there's that too :-)