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Mystery bike - need help

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Mystery bike - need help

Old 05-09-10, 01:39 PM
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velomateo
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Mystery bike - need help

First off, my apologies for those who have already seen this on RBR. But for those who have not - I'm hoping for a few sets a fresh eyes that may be able to help establish an identity of my latest find.
No serial numbers, the only markings are BCM and 73 on the lugs. Which I have been informed are Bacoma lugs and the angle of the lugs.
Very long pointed lugs and Campagnolo drop-outs front and rear. Seat post size is 26.4 - so I'm guessing Reynolds 531. Internal lug fork crown.
Over the BB cable routing. Other frame features, that may have been added later are;
f/d braze-on
two sets of water bottle bosses
pump peg
braze-on shifters mounts - There is a bump/nub under the down tube that may have been for clamp on shifters.
Chain stay bridge may have been removed to allow for larger tires - bike came to me with 28c tires.
With the possibility that the shifters were originally clamp on style - I believe, it's possible, it may have originally used cable clamps for the rear brake on the top tube.
Ok, here's the part that trips me up. The seat tube measures 54.5cm ctc and the top tube measures 57.2cm ctc. Custom?
Give the pics a good hard look and let me know what you think. Thanks.









Last edited by velomateo; 05-09-10 at 01:43 PM. Reason: incorrect image codes
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Old 05-09-10, 01:45 PM
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I forgot to mention...English bottom bracket.
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Old 05-09-10, 01:49 PM
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Can't open the pics, try just a link to the photobucket album and make sure you've made it a "public" album.
Without seeing anything, sounds like a French bike with metric 531 tubing and Campy ends: could be a Gitane Super Corsa, perhaps (just a blindman's guess).
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Old 05-09-10, 01:57 PM
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Can you see them now? They were showing on my page before but I made an adjustment to my photobucket account.
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Old 05-09-10, 02:00 PM
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I can see em!

Sorry im no help though
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Old 05-09-10, 02:20 PM
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Yes now they work, and I don't think "Gitane Super Corsa" anymore...it IS an odd mix with all those "modern" braze-ons, yet over BB cable routing and nutted brakes...looks like it's had some additions. Now my best guess is a late '70s FR bike with a trip to the torch. How about the HS and fork/stem: are they all FR specs?
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Old 05-09-10, 03:39 PM
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I haven't pulled it apart yet...being Mother's day I probably won't get a chance until later tomorrow.
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Old 05-09-10, 04:42 PM
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Originally Posted by velomateo View Post
Seat post size is 26.4 - so I'm guessing Reynolds 531.
Highly unlikely... It could be 501, but even that is unlikely. Straight gauge 4130 most likely, unless there is a shim inside the ST
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Old 05-09-10, 04:56 PM
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Originally Posted by EjustE View Post
Highly unlikely... It could be 501, but even that is unlikely. Straight gauge 4130 most likely, unless there is a shim inside the ST
no it's actually very likely for 531 if it's metric dimensions...but OP will have to measure the ODs of the main tubes to confirm that. Odd thing is the BSC BB threading, odd but not unheard of for FR bikes of a certain transitional period.
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Old 05-09-10, 07:53 PM
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I removed the fork, headset is a Stronglight and stamped 1 inch x ## F. I'm sorry I forgot the number, I think it was 24. Am I correct to assume the F = French. What should the OD of the seat tube be to confirm if it's 531?
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Old 05-09-10, 11:02 PM
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Metric tubing is all even mm's, no fractions, so the TT is 26mm, seat and DT are 28mm. Imperial sizes are based on the inch so the TT is 25.4mm (1") and seat and DT are 28.6mm (1.125"). I' think the Stronglight HS is not FR threading since it's called out in inches and tpi...so now you've got a BSC BB and fork...looking less French and more like a mystery! No serial numbers at all?
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Old 05-10-10, 04:05 AM
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[QUOTE= No serial numbers at all?[/QUOTE]

None at all.
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Old 05-10-10, 08:11 AM
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Originally Posted by velomateo View Post
I removed the fork, headset is a Stronglight and stamped 1 inch x ## F. I'm sorry I forgot the number, I think it was 24. Am I correct to assume the F = French. What should the OD of the seat tube be to confirm if it's 531?
No, Stronglight was a French company so F="fil" which is the French word for "thread." It's an English thread headset; French would be 25mm x 1.0mm.

It's a nice looking frame. Do you have any better pictures of the fork, particularly the crown? Do the fork ends match the rear dropouts in brand/model and finishing style? Just trying to determine if the fork is a replacement.
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Old 05-10-10, 10:14 AM
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I'm thinking custom by an American builder.
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Old 05-10-10, 11:30 AM
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could be^, it's definitely an odd one, and with no serial numbers it's more likely not from mass-production. Still odd that the long BCM lugs were not worked up, like the angle-stamping and the little flanges removed, if this were a custom job...most US builders would have done at least those 2 small touches.
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Old 05-10-10, 11:44 AM
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Originally Posted by JohnDThompson View Post
No, Stronglight was a French company so F="fil" which is the French word for "thread." It's an English thread headset; French would be 25mm x 1.0mm.

It's a nice looking frame. Do you have any better pictures of the fork, particularly the crown? Do the fork ends match the rear dropouts in brand/model and finishing style? Just trying to determine if the fork is a replacement.
Fork tips match the rear in brand ( Campy) and finish. I'll get a pic up later.
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