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PostPosted: Fri Jun 29, 2007 1:17 pm 
Karma Queen / Cake Meisterin
Karma Queen / Cake Meisterin
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Joined: Thu Jul 27, 2006 10:02 pm
Posts: 6727
Location: North Yorkshire
I have an old M739 chainset on my son's Cannondale. This is the one where the spider and outer chainring are one and the same and you need to change both to change one.

I bought this chainset and since being fitted the bolt holding on the spider keeps loosening off, and if I forget to tighten it he ends up with a spinning chainset. I think that either a locking ring or clip is missing.

Does anyone have a solution to this or on old knackered chainset LX/XT that is basically scrap so I can take off what is missing please :?: :D

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PostPosted: Fri Jun 29, 2007 1:20 pm 
Mr Benn
Mr Benn
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Joined: Wed Oct 25, 2006 10:07 am
Posts: 7185
Location: Omnipresent
Lock ring is important and it's probably this.

I may be wrong, but I seem to remember someone saying recently that Madison still have the lock rings for the M952 chainsets and they are the same?

Ask LTS Biker - he knows A LOT about Shimano.

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PostPosted: Fri Jun 29, 2007 1:56 pm 
Retro Guru
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Joined: Wed Nov 22, 2006 12:04 pm
Posts: 1401
Location: North East Scotland (Aberdeen)
Loctite has held my XTR one on for years :shock:

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PostPosted: Fri Jun 29, 2007 2:14 pm 
Dirt Disciple

Joined: Sun May 06, 2007 12:31 am
Posts: 12
Location: Great Britain
Yup, the XTR spider will be compatible. However, what I think you are missing is the little circular steel snap ring which should reside in a groove on the crank arm so that it sits on top of the lockring, preventing it loosening. If you are missing this then give the threads a good clean with degreaser etc and then apply a reasonable amount of threadlock to prevent it working it's way loose.

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