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PostPosted: Tue Apr 30, 2013 11:52 am 
Gold Trader / PoTM Winner / RB Rider
Gold Trader / PoTM Winner / RB Rider
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Joined: Tue Feb 26, 2013 6:26 pm
Posts: 16900
Location: 54 Festive Road Winchcombe GLOUCS Yarp...
Just bought a Marin bear valley se for the princely sum of £25. :facepalm:

The large and middle chain rings have teeth missing! (Shimano stx RC) 42 and 32/33? Teeth

Can anybody advise me as to what I should be looking for in replacement rings? I have no clue as to what will fit on the existing crank. Does it have to be shimano etc? Is there a measurement I need such as distance between bolt centres for each ring or are they all (shimano) similar?

Thanks in anticipation THM


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PostPosted: Tue Apr 30, 2013 11:58 am 
retrobike rider
retrobike rider
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Joined: Wed Apr 15, 2009 1:08 pm
Posts: 3112
Location: Woking
58mm: inner
94mm: mid and outer

I got the info from this thread:

http://www.cyclingforums.com/t/231307/h ... s-chainset

SP


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PostPosted: Tue Apr 30, 2013 12:00 pm 
Old School Grand Master

Joined: Tue Oct 09, 2007 1:55 pm
Posts: 8202
Location: New Forest, UK
If the missing teeth are all in the same place relative to the chainrings, that is deliberate and aimed to make the chain derail better. I think it's the 6 and 12 o'clock positions, but stand to be corrected!


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PostPosted: Tue Apr 30, 2013 12:03 pm 
Gold Trader / PoTM Winner / RB Rider
Gold Trader / PoTM Winner / RB Rider
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Joined: Tue Feb 26, 2013 6:26 pm
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Location: 54 Festive Road Winchcombe GLOUCS Yarp...
Missing behind pedal arm. One tooth each ring? Would that be normal?


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PostPosted: Tue Apr 30, 2013 12:04 pm 
Retro Guru
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Joined: Sat Apr 02, 2011 11:16 am
Posts: 799
Location: Camden, London
I asked a similar question on wear

viewtopic.php?f=1&t=244500

may be deliberate, rather than wear


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PostPosted: Tue Apr 30, 2013 12:06 pm 
Gold Trader / PoTM Winner / RB Rider
Gold Trader / PoTM Winner / RB Rider
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Joined: Tue Feb 26, 2013 6:26 pm
Posts: 16900
Location: 54 Festive Road Winchcombe GLOUCS Yarp...
Looked bollyhoxed to me! Having read other thread now, should I just leave it and rebuild the bike and see how it goes?


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PostPosted: Tue Apr 30, 2013 12:19 pm 
Old School Grand Master

Joined: Tue Oct 09, 2007 1:55 pm
Posts: 8202
Location: New Forest, UK
No, they are exactly the same teeth in the same position on both rings. Bet you that the ones diametrically opposite will be stubby too. Shimano do it to improve shifting.


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PostPosted: Tue Apr 30, 2013 1:11 pm 
Gold Trader / PoTM Winner / RB Rider
Gold Trader / PoTM Winner / RB Rider
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Joined: Tue Feb 26, 2013 6:26 pm
Posts: 16900
Location: 54 Festive Road Winchcombe GLOUCS Yarp...
Well you live and learn. Thanks for the clarification. Happy now. :)


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PostPosted: Tue Apr 30, 2013 9:34 pm 
Old School Grand Master
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Joined: Sun Mar 14, 2010 3:07 pm
Posts: 4211
Location: London for my sin's
Indeed. I got massive aggro for selling a chainset on ebay last year that arrived "wiv missing teef"
:roll:


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PostPosted: Tue Apr 30, 2013 9:36 pm 
Gold Trader / PoTM Winner / RB Rider
Gold Trader / PoTM Winner / RB Rider
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Joined: Tue Feb 26, 2013 6:26 pm
Posts: 16900
Location: 54 Festive Road Winchcombe GLOUCS Yarp...
Checked and surprise surprise, matching missing! :facepalm:


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