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Old 09-07-10, 06:45 PM   #1
yzfrr11
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Shimano square taper crank on a Campy square taper bottom bracket?

Will this combination work? How about the reverse?
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Old 09-07-10, 06:54 PM   #2
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I know many will jump and stuff but yes it will work. This is the disclaimer ok? Is not recommended because ISO and JIS are different, why is not recommended? because in the long term probably the crank square will get deformed and u have risk for cranking the crank also. After how many years? cant tell you, but that's why i said in the long term.

The other thing is that with one of the combination the crankset will set deeper in the axle, the issue with that is the chain line, but all depends of the length of the axles and what do you want to accomplish.

I know is not the right thing to do to mix stuff be the op asked if it will work ok? and the answer to his question is yes.

Thanks.
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Old 09-07-10, 07:28 PM   #3
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IIRC, a Campy double will not go onto a shimano BB spindle far enough to get a good chainline. (I tried this one, my braze-on derailer wouldn't go out far enough to shift onto big ring)
A Shimano double will go too far onto a Campy BB spindle.

I've also heard it wrecks your crank's holes.
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Old 09-07-10, 09:00 PM   #4
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Originally Posted by LesterOfPuppets View Post
IIRC, a Campy double will not go onto a shimano BB spindle far enough to get a good chainline. (I tried this one, my braze-on derailer wouldn't go out far enough to shift onto big ring)
A Shimano double will go too far onto a Campy BB spindle.

I've also heard it wrecks your crank's holes.
Ditto- I had a similar setup and there was a large gap from the end of the spindle to the crank's bolt face. I think the Yamaha rider will be happier with a Campy BB.
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Old 09-07-10, 10:58 PM   #5
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Sometimes like the 80s mountain bike stuff Campag made it's compatible.
I have a M730 crank and a <c> Olympus crank
swap onto the same spindle

But generally not being quite right.. taper angle is same widths are not.

[correction below, acknowledged ]

Last edited by fietsbob; 09-08-10 at 09:41 AM.
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Old 09-08-10, 09:15 AM   #6
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But generally JIS arms wont go onto an ISO spindle More than 1/2 way.

other way round and the ISO arms bottom out at the end of the square taper without being quite right..
You have this backwards. JIS and ISO square tapers share the same 4 degree included angle but ISO tapers have slightly smaller dimensioned squares at the ends. So, a JIS crank will go too far up an ISO spindle and may bottom out before it gets firmly seated. Conversly, an ISO crank won't go far enough up a JIS spindle to fully support the crank and to achieve a proper chain line.

Here is Sheldon Brown's article on these tapers: http://www.sheldonbrown.com/bbtaper.html
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