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70's Peugeot Cotter Pin Size

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70's Peugeot Cotter Pin Size

Old 07-19-13, 10:29 AM
  #1  
mayojorne
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70's Peugeot Cotter Pin Size

I damaged the threads on my cotter pins, and I can't screw the nuts back on. Is it safe to ride without the nut? I doubt my local bike shop has the right pins since French bikes have weird sizes. Can the right pins be purchased online, or would I need to file them?
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Old 07-19-13, 10:59 AM
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http://harriscyclery.net/sitesearch....SiteSearch.y=0

Looks like you need the file-
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Old 07-19-13, 11:24 AM
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I do recall riding with no cotter nuts without thinking about it and never had a problem. This followed damage to the threads caused by unsuccessful removal technique. In thinking about it, I would say that riding without the nut is not unsafe. While it may pop out, it should give you some warning by way of a little play in the crank. When the crank is under pressure (stomping up hills) I'd guess that the torque would assure that the pin would not move.

Now that I am more prudent I would replace the cotter as soon as I could; however I would still ride it nutless if only in the hope that riding it would loosen the pin.
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Old 07-19-13, 01:02 PM
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I would not call it unsafe but certainly would not use the bike for something critical like getting to work, or for long rides, until you get fresh pins.
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Old 07-19-13, 02:33 PM
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As said above, if the cotter pin is stuck hard, probably it won't get loose. You always need filing to adjust new cotter pins IME.
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Old 07-19-13, 04:40 PM
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Hi,

I have some experience in this matter being somewhat of a mechanical
thug regarding cheap rusted bikes I was basically given in my youth.

You can hammer a cotter pin tight and it will stay put for a bit,
without a nut, but when it loosens it comes loose really quickly,
and the bike becomes rapidly completely unrideable.

Which will be going up a hill probably. Drilling out your cranks
to the more common size is an option. Filing is about the
angled face and enough thread sticking out for the nut.

rgds, sreten.
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Old 07-20-13, 08:19 AM
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The best cotters and and the correct tool for the job can be found here:

http://www.bikesmithdesign.com/CotterPress/cotters.html

You can make a mess of it using a hammer.

They're called cotters in the US.

Filing is no big deal, but you need a vise.
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Old 07-20-13, 02:37 PM
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Originally Posted by Grand Bois View Post
You can make a mess of it using a hammer.
Hi,

True, but both my bike maintenance books mention hammers
and only in the context of cotter pins removal and fitting.

rgds, sreten.
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