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PostPosted: Wed Oct 17, 2012 6:02 am 
Devout Dirtbag

Joined: Sun Apr 29, 2012 2:29 pm
Posts: 104
Hi all,
I was wondering what BB to use with a Mavic 631 crank.
I don't want to use the proper Mavic BB as that would recquire cutting my BB threads.
I think I need a 113mm with ISO taper????
What offerings from Campagnolo (correct taper) can I use?
Cheers.

Also, is the 631 crank and the 631/2 use the same BB?


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 Post subject: mavic chainset
PostPosted: Wed Oct 17, 2012 5:43 pm 
rBoTM Winner
rBoTM Winner
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Joined: Mon Aug 08, 2011 5:58 pm
Posts: 162
Location: Scotland
hi there. i found a 113mm campag sealed bottom bracket worked great, and it had a nice sympathetic silver finish. obviously the length will depend on your frame, but the campag taper (whatever it is!) worked a treat. hope this helps


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 Post subject:
PostPosted: Thu Oct 18, 2012 4:07 pm 
Devout Dirtbag

Joined: Sun Apr 29, 2012 2:29 pm
Posts: 104
Yes, I think 113mm Campag is the alternate way to go.
Anyone else have any thoughts?
Cheers


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 Post subject:
PostPosted: Thu Oct 18, 2012 6:40 pm 
Dirt Disciple

Joined: Tue May 10, 2011 11:15 am
Posts: 53
Location: The Central Midlands
Cooker wrote:
Yes, I think 113mm Campag is the alternate way to go.
Anyone else have any thoughts?
Cheers


Campag & Mavic use the same BB/crank taper. From memory the standard double Mavic 631 BB is 114mm. I still have one of these BB's (now gathering dust) and used it with a mid 90's Campag chainset (designed for a 111mm BB) without problems. Another friend has one of these BB's mated to a '93 Chorus chainset and in nearly 20 years he has had no cause to touch the BB! The chainline on the Mavic can be slightly adjusted as there are lockrings on both the drive and non-drive sides. As for chamfering the BB to accept the bracket, again this is a very slight chamfering and causes no damage to the threads. I would use the Mavic BB with the Mavic chainset as this unit is miles better quality than any of the sealed Campag BB's. If not then as you say , 113 Campag is on the money length wise. If you ever wanted your BB chamfering I believe Paul Hewitt Cycles still have the chamfering tool.


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 Post subject:
PostPosted: Fri Oct 19, 2012 9:49 am 
Devout Dirtbag

Joined: Sun Apr 29, 2012 2:29 pm
Posts: 104
Ok, thankyou very much for your help!!!
Extremely helpfull and informative.
Much appreciated.


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 Post subject:
PostPosted: Sat Oct 20, 2012 1:03 am 
Gold Trader
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Joined: Wed Jun 20, 2007 11:19 pm
Posts: 7006
Location: Odense, Denmark
+1 to what it says above - you don't need to cut threads to run a Mavic BB - you just add a taper which means you can still run a normal BB afterwards. (They are nice BBs - I have three of them installed on bikes - but I also have the special tool...)

But as previously pointed out - an adjustable chainline Campag 113 would do the trick...


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 Post subject:
PostPosted: Mon Oct 22, 2012 1:03 am 
Retro Guru

Joined: Mon Jan 15, 2007 12:12 am
Posts: 1513
Location: Gold Coast Australia
I have a stronglight ISO taper BB thats fine too.
edited to say I have noticed the soft alloy crank does not get much support when a "fatter" JIS tapered spindle is used but it works ok the other way around as long as the rings or inside of the arms don't hit the frame as they go on further.


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