Steve,
This might not be a satisfying answer, but I suppose the
only way to really determine this would be to remove all the
parts from the frame and weigh it. Of course, you might leave
the headset cups in place. :-D
Anyway, a true lightweight frame would weigh less than 5
pounds for a 21" frame (perhaps 5.5 pounds for a touring bike.)
I would also note the following about French bikes from that
period. First, I have seen French bikes that were quite light
but were using seamed tubing. Perhaps this isn't even a bad
thing. I.e. you _can_ get high quality seamed tubing and it
might be that economic conditions in France during those years
made them less snobbish about that sort of thing.
Next, do not be surprised if the fork is relatively heavy
when compared to the main frame that is really light.
Apparently, the French bicycle makers assumed you would be
riding on badly paved (or pavé paved) roads.
Amitiés,
Fred Rednor - Arlington, Virginia - USA
> how do I find out if my old French 1940's(late) Semper tourer
> is lightweight
> tubing or not...I seem to recall the chap mentioning Vitus
> but can't be
> sure..there are no transfers save a rectangular dark blue one
> on the seat tube
> bottom it is about 20mmx45mm with silver wrighting on it but
> it is illegible
> due to nearly all lettering being worn off..it could be a
> makers address
> transfer. the seat post is just under 27mm. the whole bike is
> fairly light
> considering it has steel rims/hubs,cranks,pedals,rear rack
> and is fitted with full
> alloy guards and lighting/dynamo it is much lighter than my
> early 30's
> Hercules 'sports'.
>
> Steve Chambers
> Chesterfield
> England
>
>
> _______________________________________________
>
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