SEARCHING: Vintage 1972 Peugeot Cotter Pin Replacement
#1
Junior Member
Thread Starter
SEARCHING: Vintage 1972 Peugeot Cotter Pin Replacement
Hello all! I've been working on getting a Vintage Peugeot UO-18 Mixte up and running, and have run into a huge snag: I'm missing the cotter pins and don't know what type to get to replace them! I had the originals removed at a local bike shop so that I could paint the frame, but they never gave them back to me and when I asked about them they said the pins were too damaged to be reused anyway.
The trouble is, I'm having the bike built up at a different shop now and this place can't source cotter pins that fit! They said the pitch of the pins they need is different from the standard options they have available. Any ideas where I might find some? I believe this bike is from 1972 or thereabouts judging by the serial number, it's a Peugeot UO-18 Mixte.
The trouble is, I'm having the bike built up at a different shop now and this place can't source cotter pins that fit! They said the pitch of the pins they need is different from the standard options they have available. Any ideas where I might find some? I believe this bike is from 1972 or thereabouts judging by the serial number, it's a Peugeot UO-18 Mixte.
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#2
Senior Member
There are generally either 9.0mm or 9.5mm cotters. The pitch is probably the angle of the cotter face. It isnt unusual to need to file these down to match your spindle interface. I would take it elsewhere if they cant do this.
#3
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Here is where I get my cotter pins:
Bicycle Crank Cotters
The owner of this site fabricates a quality cotter press (or has someone fabricate it) and knows his way around cottered cranks.
Bicycle Crank Cotters
The owner of this site fabricates a quality cotter press (or has someone fabricate it) and knows his way around cottered cranks.
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#4
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That this shop you are using is either unaware off this, or unwilling to do it, does not bode well for your working relationship. Should be a very simple fix...maybe they just want you to take it somewhere else.
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Yes, 9mm is likely. Here is another source, he also has a great tool for removing them...
BikeSmith Design and Fabrication
btw, if the bike shop had the proper tool (and knew how to use it), they would not have damaged the original pins...
...
BikeSmith Design and Fabrication
btw, if the bike shop had the proper tool (and knew how to use it), they would not have damaged the original pins...
...
Last edited by branko_76; 08-02-20 at 01:35 PM.
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#6
Newbie
I know this an old thread and I hope your project was a success.
I’m working on a UO8 now and I had to order three different pins - because I didn’t measure properly. After I finally got a digital calliper (yay new toy!) I know it takes 8.5mm pins.
the 8.5 pins I received have a different pitch. As the others mentioned it needs to be filed down which I will do soon.
btw I use a vice grip as a cotter press. By trying to force the new pins in - and then removing them - I got a nice notch on the face/pitch area. That mark will be a nice reference for when I file it down.
I’m working on a UO8 now and I had to order three different pins - because I didn’t measure properly. After I finally got a digital calliper (yay new toy!) I know it takes 8.5mm pins.
the 8.5 pins I received have a different pitch. As the others mentioned it needs to be filed down which I will do soon.
btw I use a vice grip as a cotter press. By trying to force the new pins in - and then removing them - I got a nice notch on the face/pitch area. That mark will be a nice reference for when I file it down.
#7
PM me your cotters
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I hope the OP ran like hell with their bike. If the shop can't figure out how to measure to figure out which diameter cotter, and don't understand the basic concept of filing a cotter, they're probably not going to properly install the cotters. Wonder if they ever updated the status?
Jsendin I see you saying 8.5mm is the correct size cotter for your Peugeot, I'm curious what year it is, what crank is on it, and whether the BB spindle is original. I swear the 70s-80s era bikes took a 9.0mm cotter, it's what I've shipped out to nearly everyone I've ever gifted to here on BF for their French bikes over the years. Maybe I'm smoking crack, but I've popped enough cotters out in my lifetime you'd think I'd remember.
Edit: I'm also curious how you measured. Did you measure the inner diameter of the hole in the crank and that's where your measure came from?
Jsendin I see you saying 8.5mm is the correct size cotter for your Peugeot, I'm curious what year it is, what crank is on it, and whether the BB spindle is original. I swear the 70s-80s era bikes took a 9.0mm cotter, it's what I've shipped out to nearly everyone I've ever gifted to here on BF for their French bikes over the years. Maybe I'm smoking crack, but I've popped enough cotters out in my lifetime you'd think I'd remember.
Edit: I'm also curious how you measured. Did you measure the inner diameter of the hole in the crank and that's where your measure came from?
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#8
Newbie
Hey francophile i have to start with a disclaimer. Cotter pin cranks scare me so I always stayed away from bikes that em.
I got this bike in a lot with several others so it kind of forced me to Encounter The Cotter.
Here are some pics of bike, crank, old pin which I destroyed as a cotter pin newbie (one guess what I tried to do haha) and new pin after filing down. Also a pic of how I measured.
I switched to flat bar as the original drop bar and stem didn’t inspire much confidence. Because the frame wasn’t in great shape and it’s not really a special Pug i didn’t mind mixing it up a bit
PS all of the reference I found online spoke of 9mm or 9.5mm cotters so that’s where I started originally
I got this bike in a lot with several others so it kind of forced me to Encounter The Cotter.
Here are some pics of bike, crank, old pin which I destroyed as a cotter pin newbie (one guess what I tried to do haha) and new pin after filing down. Also a pic of how I measured.
I switched to flat bar as the original drop bar and stem didn’t inspire much confidence. Because the frame wasn’t in great shape and it’s not really a special Pug i didn’t mind mixing it up a bit
PS all of the reference I found online spoke of 9mm or 9.5mm cotters so that’s where I started originally
#9
PM me your cotters
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Hey francophile i have to start with a disclaimer. Cotter pin cranks scare me so I always stayed away from bikes that em.
I got this bike in a lot with several others so it kind of forced me to Encounter The Cotter.
Here are some pics of bike, crank, old pin which I destroyed as a cotter pin newbie (one guess what I tried to do haha) and new pin after filing down. Also a pic of how I measured.
I switched to flat bar as the original drop bar and stem didn’t inspire much confidence. Because the frame wasn’t in great shape and it’s not really a special Pug i didn’t mind mixing it up a bit
PS all of the reference I found online spoke of 9mm or 9.5mm cotters so that’s where I started originally
I got this bike in a lot with several others so it kind of forced me to Encounter The Cotter.
Here are some pics of bike, crank, old pin which I destroyed as a cotter pin newbie (one guess what I tried to do haha) and new pin after filing down. Also a pic of how I measured.
I switched to flat bar as the original drop bar and stem didn’t inspire much confidence. Because the frame wasn’t in great shape and it’s not really a special Pug i didn’t mind mixing it up a bit
PS all of the reference I found online spoke of 9mm or 9.5mm cotters so that’s where I started originally
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#10
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#11
PM me your cotters
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Not sure what to tell you. I can measure the cotters from the crank pictured below and let you know what those were. I swore they were 9.0 but you'll find 8.5 and 9.0 used on central European bikes of the era.
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