Pre 1950s rides of LFGSS: old bikes, vintage rats, classic lightweights

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Skülly

@bigblock you did a super job there.

I have a slightly odd question for you knowledgeable people:

Does anyone have (or even just know if they exist?!) a stem with a smaller bottom section than for 1” steerer? Reason: A good friend, who welds a lot, is teaching himself how to braze frames ... he bought ‘practice’ tubes from Ceeway, I suppose what some call a ‘gaspipe’ frame tubeset, to start off. He’s already assembled his fork, then discovered the internal diameter of the steerer is 20.6mm, something like 13/16”... he seems to have gathered this may have been a common internal diameter at some distant point in the past, perhaps even pre-lightweight era, or kids’ bikes perhaps, who knows?

Does anyone have any knowledge of such a standard?

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Egghead in reply to @Skülly

There is a 21.15mm size for steerer ID, where the steerer OD was still 25.4mm (1") - i.e the steerer is made from thicker tubing that the regular 25.4mm OD/ 22.2mm ID. Was common on BMX and on some early MTBs and one-piece crank bikes. Not as small as 20.6mm though.

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Skülly in reply to @Egghead

Egghead, thanks so much for that wisdom! I’ll get him to check his internal dia with this in mind. I was wondering if the old headclip type bikes might have had tiny quills.

Next stop the VCC brigade, to see if there’s an even teenier quill size back in the mists of time.

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