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PostPosted: Mon Aug 09, 2010 12:06 pm 
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Joined: Sun Mar 30, 2008 2:01 pm
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Location: South West
Hello all,

Would anyone know or have any advice on what type and what length of bottom bracket (Italian thread I think) could be used with a Mavic 630 SSC chainset being used for a retro fixie build?

Cheers


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PostPosted: Mon Aug 09, 2010 9:37 pm 
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Original spec was 114mm - but depends on what chainline dimension you're running which will be dictated by the hub model i.e. 42mm track or 46mm road?


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PostPosted: Mon Aug 09, 2010 10:09 pm 
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I will be using an old campag record road hub.

I'm thinking a miche primato might do it, thats a 107mm spindle and I believe it's slightly adjustable as well.


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PostPosted: Tue Aug 10, 2010 12:29 pm 
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Mavic's axle recommendation for the 630 for a single chainring was 110mm (116mm for a double). That puts the chainline at about 42mm. You need Campag (ISO) tapers. Given all that, I think the Primato isn't a bad choice.

With a road rear hub, you have plenty of freedom to respace the axle to get the chainline you want. If you screw a track sprocket onto the hub without respacing it, you'll find the required chainline impractically narrow, so my approach would be to fit the cranks, measure the resulting chainline, then respace the hub to suit.


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PostPosted: Tue Aug 10, 2010 12:47 pm 
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Ace reply - thanks.

Whats the best way to measure the chain line?


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PostPosted: Tue Aug 10, 2010 12:52 pm 
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Like this:

Image

http://www.sheldonbrown.com/chainline.html


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PostPosted: Tue Aug 10, 2010 12:58 pm 
Retro Guru

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That means I have to read now! haha!

Do you reckon a Campag Veloce 111mm BB would do it?

Thanks again


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PostPosted: Tue Aug 10, 2010 1:14 pm 
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oaep7 wrote:
Do you reckon a Campag Veloce 111mm BB would do it?

Yes, in fact I was going to suggest a Campag 111mm unit as an alternative. If you can find one, I'd prefer a mid-nineties Athena, or a Record or Chorus cartridge unit. The latter will be expensive, but they're very good quality. All of those models have adjustable chainline, like the Miche Primato. The modern Veloce doesn't.

As it happens, the Miche Primato, the Veloce, and the mid-nineties Athena are all made by Kinex in Slovakia. The cups and cartridge bodies are all interchangeable: Athena cups on a Primato cartridge, etc.


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