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 Post subject: French Bottom bracket
PostPosted: Sun Jan 02, 2011 9:22 am 
Old School Hero

Joined: Thu Nov 11, 2010 7:54 pm
Posts: 235
Location: Belfast
anyone know where you can source a french bottom bracket for reasonable money at the minute, for my novy build?

cant see any velo orange ones on freshtripe and phil woods seem a bit spendy.

Trying to avoid a threadless BB.

Measured shell width for novy - 73mm and cottered spindle length seems to be 138mm.

ermmm. bit melted with this as all the french ones listed seem to be 68mm and 110m.


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 Post subject:
PostPosted: Sun Jan 02, 2011 8:17 pm 
Retro Guru

Joined: Sun Aug 22, 2010 7:07 pm
Posts: 1323
Location: Cotswolds
When Cinelli Super Corsa arrived about 1960 we had the choice (fortunately) of only 2 decent chainsets, 49D/TA or campagnolo. The SC had a 74mm width, our chainsets were only available 68mm. So I softened an old adjustable cup, filed a hex in the centre, and used this as a guide to cut 3mm off each side.
This at the time was the only way. It may not be possible on your frame, or you may not feel like ruining it, but 50 years ago we had to find practical solutions.


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 Post subject:
PostPosted: Sun Jan 02, 2011 8:25 pm 
Old School Hero

Joined: Thu Nov 11, 2010 7:54 pm
Posts: 235
Location: Belfast
wouldn't the threading still be off?

sounds a bit scary anyway, If it comes to that I'll get a threadless.


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 Post subject:
PostPosted: Sun Jan 02, 2011 8:39 pm 
Retro Guru

Joined: Sun Aug 22, 2010 7:07 pm
Posts: 1323
Location: Cotswolds
50 years ago all these expensive facing tools did not exist. All the new Cinelli SC's I sold had this treatment. The wider bottom bracket was a good theory, with the weight on the bearings lessened being further apart, but no-one wanted a cottered chainset on a bike in the £70 / £80 price range.
Never any problems, why should it affect the threading? You know the French and Italian threads then were both RH, although different diameters.


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 Post subject:
PostPosted: Sun Jan 02, 2011 9:13 pm 
Old School Hero

Joined: Thu Nov 11, 2010 7:54 pm
Posts: 235
Location: Belfast
if same threading would a 74mm bb not do then?

thats like 1mm spread over two sides?


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 Post subject:
PostPosted: Sun Jan 02, 2011 9:26 pm 
Retro Guru

Joined: Sun Aug 22, 2010 7:07 pm
Posts: 1323
Location: Cotswolds
I thought your problem was the width, but you should be able to have the adjusting cup 1mm further out if that helps. I was in the old days of 24 tpi and metric diameters. Hope you get it right.


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 Post subject:
PostPosted: Sun Jan 02, 2011 9:32 pm 
Old School Hero

Joined: Thu Nov 11, 2010 7:54 pm
Posts: 235
Location: Belfast
its the french threading, its a different TPI no?

the problem I also had is when I look up the typical french sizing my BB is too big.


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 Post subject:
PostPosted: Sun Jan 02, 2011 9:51 pm 
Retro Guru

Joined: Sun Aug 22, 2010 7:07 pm
Posts: 1323
Location: Cotswolds
Is it 35mm x 1mm?
All my stuff now is British fitting, apart from the 3 old Italian bikes, which are 36mm x 24TPI. Thats enough, but they'll never wear out at the present rate of use.


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 Post subject:
PostPosted: Sun Jan 02, 2011 9:53 pm 
Old School Hero

Joined: Thu Nov 11, 2010 7:54 pm
Posts: 235
Location: Belfast
yep 35 x 1 I think, on the verge of just getting the velo orange threadless and calling it a day! £45 tho!

would a pic of the cups help?


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 Post subject:
PostPosted: Sun Jan 02, 2011 10:07 pm 
Retro Guru

Joined: Sun Aug 22, 2010 7:07 pm
Posts: 1323
Location: Cotswolds
I've probably confused things enough for one day.


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