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PostPosted: Sat Apr 09, 2011 8:14 am 
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Joined: Sun Jan 30, 2011 5:08 pm
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Location: Warwickshire
Hello,

Would a square taper type Campag Chainset like a Campag Mirage fit on a Shimano type square taper Bottom Bracket like a UN71?

Cheers,

K.:)


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PostPosted: Sat Apr 09, 2011 10:24 am 
retrobike rider
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Location: Bristol
Very no. Although it would " fit " the tapers are different angles and you'd sh@g the chainset quite soon as it would need constant re-tightening.

You're after an english thread Campy BB like this.


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PostPosted: Sat Apr 09, 2011 12:32 pm 
South East AEC
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I have been running this set up for 5 years with no problems.


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PostPosted: Sat Apr 09, 2011 12:44 pm 
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Location: Olissipo-PT
here's what sheldon says...

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


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PostPosted: Sat Apr 09, 2011 3:31 pm 
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Ahh so you can but the Campy Chainset will sit 4.5mm further out due to the shorter nature of the Shimano taper.

Good stuff. :)

Thanks chaps. 8)


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PostPosted: Tue Apr 12, 2011 9:07 am 
Old School Grand Master

Joined: Tue Oct 09, 2007 1:55 pm
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Location: New Forest, UK
It's barely on the taper - only about 5mm or so.
I've tried it and the crank fell off some 100 miles later with the tapers trashed. I knew I had taken a risk and really tightened up the bolt too. :oops:

So try it if you are prepared to trash the crank. However, as Campag BBs are both durable and cheap, I'd just buy one... 8)


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PostPosted: Tue Apr 12, 2011 9:12 am 
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Location: Sheffield, top city
hamster wrote:
It's barely on the taper - only about 5mm or so.
not my experience. All my bikes have campag chainsets on shimano BB's. They all sit firm & proper, have never had one fall off. Like someone says, they just sit a bit further out, remedied by getting a shorter axle. Only thing to watch is that the axle end fixing bolts should be shimano, campag seems a different threading (it'll work once if youre desperate, , but the bolt threads are then knackered).


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PostPosted: Tue Apr 12, 2011 6:17 pm 
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hamster wrote:
Try it if you are prepared to trash the crank. However, as Campag BBs are both durable and cheap, I'd just buy one... 8)


Best advice by far.

At the point where I didn't realise the tapers were different I did the opposite and ran a Campagnolo BB with a JIS-tapered chainset. It came loose every few miles.
For the price of a Campagnolo BB, I'd just buy a new one and run your chainset as the manufacturer intended.


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PostPosted: Tue Apr 12, 2011 6:33 pm 
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Joined: Sun Aug 03, 2008 12:31 am
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Location: London
I've tried just putting a Campagnolo crank up to a Shimano BB by hand, it goes on about less than halfway.

It seems the Shimano bb is bigger in diameter but has the same taper angle. So when you tighten a Campagnolo crank onto a Shimano BB, it does not go on as far it would on a Campagnolo BB. A Stronglight 49D cranks is even smaller and hardly goes on a Shimano bb at all.

I don't think it's a good idea to have less than the full contact area between the crank tapers and the BB axle. But it seems people haven't had problems with it.


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PostPosted: Tue Apr 12, 2011 8:21 pm 
Old School Grand Master

Joined: Tue Oct 09, 2007 1:55 pm
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Location: New Forest, UK
pigman wrote:
Only thing to watch is that the axle end fixing bolts should be shimano, campag seems a different threading (it'll work once if youre desperate, , but the bolt threads are then knackered).


No the bolts are the same, metric thread (M8?). However, as the Campag BB has a finer tip, you have a good point in that the top of the hole in the crank is a different size.


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