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New project: 1950s-ish(?) Motobécane Pantin

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New project: 1950s-ish(?) Motobécane Pantin

Old 05-27-17, 06:44 AM
  #1  
mavimao
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New project: 1950s-ish(?) Motobécane Pantin

Hello everyone! I found this bicycle online for 30€ and it caught my eye. I like its vintage look and hope to clean it up and use it as a Sunday stroller kind of bike (I hate having to go slow for family group rides on my kilo TT). My immediate plans are to clean up the frame, replace the cables, replace a wingnut, replace the bartape with some brown faux leather tape, put on a spare Brooks saddle I have lying around and I'll have to probably replace the rear Huret derailleur (UPDATE: actually, in the end, all I needed was a spring which I found online! Here's the thread in the mechanical forum: https://www.bikeforums.net/bicycle-me...l#post19613753). The rims are a bit wobbly so I'll probably have to true those as well.

Long term, I'm thinking of maybe trying to modernize the lighting system, but after a quick Google search, it doesn't seem as easy as I thought. The little generator is missing, so I'll need to find a spare somewhere.

Oh and there seem to be two little pointy hooks behind the seat tube and I'm guessing that's for a pump. Is there some kind of standard size for those?

Anyways, any tips or comments would be great. I'll be sure to come back and put up some 'after' photos.












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Old 05-27-17, 06:47 AM
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You did awesome for 30 euros. I love the bike. C'est magnifique.

On any old bike, I'd pull it entirely apart. That will make it easier to get to any issues with the paint. You want to get on top of any rust issues and wax the frame. You will also want to completely overhaul the bike and replace all the ball bearings. Normally I'd replace all the consumables as well but some of these cables will be tough to find so I'd be careful with them. Good luck finding a RD for your bike. For the pump, just measure the distance between the 2 pegs and find a pump to fit.

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Old 05-27-17, 07:11 AM
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Wonderful find! I think you will really enjoy that bike. Please post photos when you are cleaning it up, especially of details like lugs, bottom bracket, etc. I want to live vicariously through you!
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Old 05-27-17, 07:41 AM
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Wow! I would have gone for that too!
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Old 05-27-17, 09:38 AM
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Oh, to be in France...I peruse ebay.fr much too often, search velo ancien, and bikes like the show up often, but for 2-300 Euros, plus shipping to US!

"Bottle cap" dynamos are readily available.



Measure the distance between the pump pegs so you know what size pump to look for. Pashley sells a nice retro pump that would fit.
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Old 05-27-17, 09:50 AM
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Very nice!

Modernizing the lights is not that difficult. Don't throw away the bulbs that are in there, even if they're burned out; you can use the base to make an LED light. Almost any LED will be an improvement. A really first rate light like a modern LED headlight is complicated but something pretty good is easy. More on that later.

Nice bike!
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Old 05-27-17, 12:25 PM
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Thank you for all the nice compliments everyone! I found out in the thread I started in the bike mechanics section that I am missing an external spring that takes up the slack in the chain, so that ensures that I am able to keep the original derailleur. Cool!
@gugie: old French bikes aren't TOO hard to find at a good price. A good place to go is leboncoin.fr which is the French equivalent of Craigslist. Just type in "vélo vintage" or just vélo and then a brand name and you have to sift through a bit. Thanks for the tips!
@rhm: concerning the lights, I had read that the little generators generate AC and that the LEDs need DC power. Maybe I read that wrong...? If it's as easy as it sounds, I'm all ears.
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Old 05-27-17, 01:00 PM
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Originally Posted by mavimao View Post
...
@rhm: concerning the lights, I had read that the little generators generate AC and that the LEDs need DC power. Maybe I read that wrong...? If it's as easy as it sounds, I'm all ears.
That is correct: LED's require DC, dynamos make AC. There are two ways to overcome this obstacle. The "correct" thing to do is to convert the AC to DC with a bridge rectifier, which is not difficult, takes up a small amount of space, and requires four soldered connections.

But there is an even easier way. Your little generator usually has only one place to attach a wire; it uses the bike frame as ground, in place of a second wire. So what you need to do is this: run a wire from the generator to the + on the headlight LED, and a wire from the frame to the - on that LED; and do the opposite with the tail light LED (so, a wire from the generator to the -, and a wire from the frame to the +). If you do this, the headlight and taillight LED's will light alternately. They will flash visibly at low speed, but at any normal speed the light will be constant and smooth.
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Old 05-27-17, 01:17 PM
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Originally Posted by rhm View Post
That is correct: LED's require DC, dynamos make AC. There are two ways to overcome this obstacle. The "correct" thing to do is to convert the AC to DC with a bridge rectifier, which is not difficult, takes up a small amount of space, and requires four soldered connections.

But there is an even easier way. Your little generator usually has only one place to attach a wire; it uses the bike frame as ground, in place of a second wire. So what you need to do is this: run a wire from the generator to the + on the headlight LED, and a wire from the frame to the - on that LED; and do the opposite with the tail light LED (so, a wire from the generator to the -, and a wire from the frame to the +). If you do this, the headlight and taillight LED's will light alternately. They will flash visibly at low speed, but at any normal speed the light will be constant and smooth.
I did not know this! Thanks for the tip!
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Old 05-28-17, 08:37 AM
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I love the bike. Perfect for a social ride with friends and family. Would have the hubs, bottom bracket and headset cleaned and regreased. The grease there now is certainly contaminated and needs replacing.
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Old 05-28-17, 09:47 AM
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Originally Posted by Barrettscv View Post
...Would have the hubs, bottom bracket and headset cleaned and regreased. The grease there now is certainly contaminated and needs replacing.
That would be a good guess, and you have to check and see to find out one way or the other. But with tires that new looking, the bike may have been fully serviced within the last few years, so who knows?

Regardless, what a great catch, @mavimao! Just about everything on that bike tics off the boxes a a C&Ver likes to see.
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Old 05-28-17, 10:37 AM
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Originally Posted by rhm View Post
That is correct: LED's require DC, dynamos make AC. There are two ways to overcome this obstacle. The "correct" thing to do is to convert the AC to DC with a bridge rectifier, which is not difficult, takes up a small amount of space, and requires four soldered connections.

But there is an even easier way. Your little generator usually has only one place to attach a wire; it uses the bike frame as ground, in place of a second wire. So what you need to do is this: run a wire from the generator to the + on the headlight LED, and a wire from the frame to the - on that LED; and do the opposite with the tail light LED (so, a wire from the generator to the -, and a wire from the frame to the +). If you do this, the headlight and taillight LED's will light alternately. They will flash visibly at low speed, but at any normal speed the light will be constant and smooth.
I thought about that but never pursued it. Cool. My second thought on that was that the output of those generators is very speed dependent, way back I kept burning out bulbs. The third time the bike shop owner sold me bulbs he stated I might be riding too fast too often. "Going down any hills?" No. Hmmm.

I really like this Moto' by the way. I think a good family bike. In college I had a 28" wheeled roadster, I used that when going out on a "bike ride" with date, I think the position on the bike helped keep the speed friendly.

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Old 06-03-17, 09:50 AM
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I have an update in my other derailleur thread concerning that particular part: https://www.bikeforums.net/19628858-post18.html

Other than that, I'm simply just waiting for cables and bartape to come in the mail. I did clean it up a bit and attached my brooks saddle. It looks really nice on it!

I think I'm going to get a membership at the local bike co-op because I do have other bikes that need work and I would really like to have a better variety of tools to work with. On this bike alone, I am going to have to redo the bottom bracket (it wobbles a bit), true the wheels and other odds and ends.
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Old 08-28-20, 09:12 AM
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MotoBecane Pantin Parts Identification

Hi

I have just been given a MotobBecane frame to restore. It seems to have boosses for front cantilever brakes, and for the rear brakes the hole is vertical not horizontal.

The mountings for the rear derailleur look strange. Which hanging bracket is used?

Can anyone identify the brake type used, so I can search for them.

Thanks.
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