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PostPosted: Sat May 30, 2020 11:42 am 
Old School Grand Master
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Joined: Thu Jul 19, 2007 7:18 pm
Posts: 3840
Location: Staffordshire
I think the answer is yes. 6mm too small and 8mm is too large. Of course, none of my sets have 7mm. I wonder how I did it before?

Does anyone know if 3/8 will be close enough?


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PostPosted: Sat May 30, 2020 11:53 am 
Old School Grand Master
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Joined: Fri Oct 14, 2011 8:41 pm
Posts: 9957
Location: Cumbria
Velobase says 6mm for 1a, is yours more recent?

http://velobase.com/ViewComponent.aspx? ... B&Enum=102


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PostPosted: Sat May 30, 2020 11:56 am 
Old School Grand Master
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Joined: Thu Jul 19, 2007 7:18 pm
Posts: 3840
Location: Staffordshire
Midlife wrote:
Velobase says 6mm for 1a, is yours more recent?

http://velobase.com/ViewComponent.aspx? ... B&Enum=102


Not sure. Just realised 3/8 is way big. I'm going to go through the toolbox and see what is lurking in the corners.


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PostPosted: Sat May 30, 2020 12:19 pm 
Old School Grand Master
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Joined: Thu Jul 19, 2007 7:18 pm
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Location: Staffordshire
velobase.com/ViewComponent.aspx?ID=3C3F47E5-D410-4170-9380-C60BD8D75DB1&Enum=102&AbsPos=5

That's the one I think. Certainly got the same bar clamp bolt. I'm off to the shop then!


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PostPosted: Sat May 30, 2020 1:16 pm 
Old School Grand Master
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Joined: Thu Jul 19, 2007 7:18 pm
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Location: Staffordshire
Shop didn't have one. I was getting desperate when I found a 7mm insert for a screwdriver bit set. Result! I'll do it up with a spanner.

I can confirm that the stem is indeed 7mm.


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PostPosted: Sun May 31, 2020 7:32 am 
Old School Hero

Joined: Wed Sep 06, 2017 5:38 pm
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7mm is the Corsa Record chainset bolt size so there have been a few in my toolbox for some time. I recently (last couple of years) bought a 1/4" drive 7mm bit for my "long trip" tool set so I know that they are widely available. I'm surprised that the 1A is 7mm since the 1R is 6mm but will take your word for it. Good luck and I hope you fix it.


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PostPosted: Sun May 31, 2020 9:36 am 
Old School Grand Master
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Joined: Thu Jul 19, 2007 7:18 pm
Posts: 3840
Location: Staffordshire
Yes, all sorted. I found a 7mm 1/4 inch drive bit in a set I found in the recesses of the garage.

The stem is (I think) one of these:

velobase.com/ViewComponent.aspx?ID=3C3F47E5-D410-4170-9380-C60BD8D75DB1&Enum=102&AbsPos=5

Hopefully the link works this time!

Edit: No it hasn't worked. I can't be arsed to put any more time into it! It is a Cinelli 1A Earlier version. Late 60s into 70s. It is the one with a hex bolt to tighten up on to the bars.


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