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Newbie with a Motobecane unknown model questions.

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Newbie with a Motobecane unknown model questions.

Old 04-05-15, 11:29 AM
  #26  
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yes, '72/'73 is older than '76.

here's are a few moto threads:

https://www.bikeforums.net/classic-vi...ght=motobecane
https://www.bikeforums.net/classic-vi...ght=motobecane
https://www.bikeforums.net/classic-vi...ght=motobecane
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Old 04-05-15, 11:38 AM
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Just weighed the frame bare on its own 2kg ! Seems very lightweight, does this help with the model I'd ?
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Old 04-05-15, 01:25 PM
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You know, I totally looked right past the word "older" and thought you were meaning "post-1976"! Haha! My apologies for that! You'll have to forgive me, I've been up since 4:00 (eastern time zone) this morning and my brain is a bit frazzled from being at work.
Thanks for posting the serial number database link! That will be some useful information.
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Old 04-05-15, 01:37 PM
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Originally Posted by auchencrow
Measure the seat post. Generally a 26.4 or larger seat post diameter indicates a Reynolds '531 Moto frame.
mine is 26.6 so it indicates a Reynolds 531 Moto frame
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Old 04-05-15, 02:02 PM
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just got back from work, i was replying to the posts via my iphone so didn't get a good look at all the replies, thank you for them, i'm going to go through them i'll post a reply later and let you know what i make of the database info, it looks really useful ..thanks

Looks like it's a 73 model picture shows a stamp below the headset, a step closer to a full I'd

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Old 04-11-15, 05:44 AM
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The top & bottom head lugs have a emblem stamped BCM on each, has anyone seen this before ? Also the seat lug is stamps 75. There appears to various different theories on the range of numbers stamped on the Motobecane frames, I think it's safe to say it's build is around the mid 70's. I'm going to base the colour I spray on catalog pics of this period the light metallic Blue appeals with the Aluminium components to set it off.
I post more pics along the build.

Cheers guys
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Old 04-11-15, 06:43 AM
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Originally Posted by zola1
The top & bottom head lugs have a emblem stamped BCM on each, has anyone seen this before ? Also the seat lug is stamps 75. There appears to various different theories on the range of numbers stamped on the Motobecane frames, I think it's safe to say it's build is around the mid 70's. I'm going to base the colour I spray on catalog pics of this period the light metallic Blue appeals with the Aluminium components to set it off.
I post more pics along the build.

Cheers guys
I believe "BCM" stands for Bacoma and refers to the makers of the lugs. If you do an online search for Bacoma you will find a lot of information on them.
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Old 04-11-15, 07:16 AM
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"Bacoma", not to be confused with Tacoma, producer of wood-derived products and accompanying odor, known as the "Tacoma Aroma"...
I heard tell there is also a lug manufacturer with the very similar handle Bocama...
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Old 04-11-15, 07:27 AM
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Originally Posted by old's'cool
"Bacoma", not to be confused with Tacoma, producer of wood-derived products and accompanying odor, known as the "Tacoma Aroma"...
I heard tell there is also a lug manufacturer with the very similar handle Bocama...
Oh cr*p. I did spell it wrong, didn't I. Yes...Pacific Northwest....Tacoma.....only one cup of coffee and ​it's very early here.
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Old 04-11-15, 08:04 AM
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Originally Posted by Velocivixen
I believe "BCM" stands for Bacoma and refers to the makers of the lugs. If you do an online search for Bacoma you will find a lot of information on them.
great info thank you will do

derrick
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Old 04-11-15, 10:22 AM
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Got a question on the Huret rear dropouts here are some pics :-

mine has a bodged end stop 1st pic any idea of the correct set up ? Please see other pictures, any Huret supplier that stocks them ?


Cheers derrick
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Old 04-11-15, 11:05 AM
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zola 1-

The 73 30 and the 75 on the lugs is the angle of the tube socket and is not useful for dating production. The centre picture is correct. Huret dropout adjusters use a unique thread at 4 mm for the hole with 0.8 mm threading. Every other adjuster is 5.0 mm x 0.8 mm. However, if you can't find Huret on EBay, then the dropouts can be tapped to 5.0 x 0.8. I've not done it but Sutherlands says it is possible.
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Old 04-11-15, 11:18 AM
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Originally Posted by bertinjim
zola 1-

The 73 30 and the 75 on the lugs is the angle of the tube socket and is not useful for dating production. The centre picture is correct. Huret dropout adjusters use a unique thread at 4 mm for the hole with 0.8 mm threading. Every other adjuster is 5.0 mm x 0.8 mm. However, if you can't find Huret on EBay, then the dropouts can be tapped to 5.0 x 0.8. I've not done it but Sutherlands says it is possible.
Hi thank you for the info, would these stamps indicate the year, with Huret dropouts and Bocama lugs ?
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Old 04-11-15, 12:36 PM
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as far as i know, no one has cracked the code on motobecane serial numbers to indicate year or any other information. that thread i posted was established to begin a database to do so. it is far from complete.

the way we determine moto frame dates is usually relegated to referring to the online catalogs in terms of paint scheme and model options (brazing, bosses, frame material, wheel size, component groups, etc.). when found, component dates can also be helpful.
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Old 04-11-15, 03:38 PM
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ok, i 'll try that, there are several original parts on the bike , no more blind alleys with the stamping on the frame, get on with the build..
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Old 04-11-15, 05:31 PM
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Also, if I may add one caution. It can be very tricky to get an accurate measurement of the inside diameter of the seat tube using the method shown above. The slot cut into the seat lug can introduce innacuracies. Better to measure the seat post if you have it and it was a nice fit. If not, it's best to measure below the seat lug slot, which requires a different tool , or two. FWIW.
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Old 04-11-15, 11:49 PM
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Thanks good advice, the seat post was a snug fit and I had to soak it with WD40 to get it out. The Chrome plating has corroded above he pinch point so I'll measure below that line. I have looked for any makers details, no name etc so I assume is not the original (the current seat is a modern plastic one. I'm looking at some options, Brooks look great (price !) eBay France might be worth a bit of searching. Any thoughts on the original seat post e.g was it Chrome or Alu ? Cheers
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Old 04-12-15, 12:33 AM
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Originally Posted by stevegreer
You think so? This link shows a '72 and '73 that has the exact same head badge as his. I know that's not a true indicator since head badges can be changed, but it was the basis for my guess for his being one of those years. Do you have pictures posted of yours somewhere? I'd love to take a look at them. Motos are some beautiful bikes!
VeloBase.com - Head Badge Gallery
Found this link looks like it has some bits of useful date related info :-

Date of Manufacture of Bicycle Components can be used to date a bike: component dating
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