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PostPosted: Wed Feb 01, 2012 3:45 pm 
Old School Grand Master
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Joined: Mon Jun 14, 2010 9:06 pm
Posts: 4424
Location: Herts UK
Dead Rats wrote:


Neither, this is the correct answer. :wink:
http://www.chainreactioncycles.com/Mode ... elID=10219

and is what I have.

I used to use a vernier calliper to measure up 10 links but the tool is far better and easier to use.

Anyone who does their own bike manitenance should have this tool.


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PostPosted: Wed Feb 01, 2012 5:57 pm 
retrobike rider
retrobike rider

Joined: Sun Sep 23, 2007 11:22 pm
Posts: 7305
Location: Hove
I have always followed Sheldon Brown's advice to measure 24 links with a ruler and if they measure 12 1/16th (i.e., they have stretched by 1/16th) then you should replace the chain if you want to avoid any damage to the rings and sprockets. If they measure 12 1/8th, the chain is seriously in need of replacement and you can assume that it has caused damage to the rings and/or sprockets.

This is easy (if you steal a ruler from your local museum) and the criteria are roughly the same - i.e., 1/16th is c0.5% of 12".

Provided you change chains when they reach 12 1/16th, you don't need to replace the sprockets every time you use a new chain, as the sprockets will outlast several chains.

However if you don't replace chains until 12 1/8th or later, you will have damaged the sprockets and you may well need to replace both at the same time.


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