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Campagnolo Athena 8 speed bottom brackets..

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Campagnolo Athena 8 speed bottom brackets..

Old 02-27-12, 01:15 PM
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Tychom
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Campagnolo Athena 8 speed bottom brackets..

So I picked up an 8 speed groupset recently, mostly Athena with a little Chorus and some Mavic wheels. I was reading up on it before it arrived and as far as I could tell (Velobase and other sources) it was going to come with a 111mm bottom bracket. Well it did, but it's a Shimano UN-54 - JIS taper.

So where I'm at now is wondering should I stick with this BB? From what I understand the Athena cranks (which I'm fairly sure these are - I know the Campy designs filtered through their groupsets during the years - these have an A3 date code) were designed for a Campagnolo tapered 111mm BB and that this JIS tapered BB should put them slightly further out - not as far as ISO cranks on a JIS BB but a little nonetheless.

Is the difference and hence the performance going to be enough that it's worth springing for an old early 90s Chorus BB or similar (about 60eur around these parts) or is this something I shouldn't worry too much about and simply mount them again as is?
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Old 02-27-12, 02:03 PM
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I'd mount it and check your chainline. If it's close enough to 43.5mm and you like the way the left arm looks (the Campi may not have been symmetric, but the Shimano is), then ride it without worry.

Here's another question - Campi adopted ISO in '94. Is your 8s crankset pre'94 or '94+? If pre, then your JIS would actually be "closer" to the pre'94 taper than would a modern ISO. (as per Phil Wood's advice)
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Old 02-27-12, 02:24 PM
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I've been hunting the internets trying to find that information the cranks only have their length, pedal threading and an A3 in a square. So the latter should be the date code but I'm having little luck decoding it.
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Old 02-27-12, 03:47 PM
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Sounds like 1993 cranks...

Originally Posted by Tychom View Post
I've been hunting the internets trying to find that information the cranks only have their length, pedal threading and an A3 in a square. So the latter should be the date code but I'm having little luck decoding it.
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Old 10-09-21, 05:47 AM
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I have the same set up the bike came with a Shimano bb. Late to this thread but glad it exists as bb tapers can be difficult to decipher what is actually going on. I have a Campagnolo ATB chainset. It could be an Elucid? I don't know? There's no way of telling. I think it's probable that this has a JIS bb. I've never fitted it to a bike but it's about time I did.
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Old 10-09-21, 08:34 PM
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I've measured a lot of bottom brackets, and everything I've seen is in line with the ISO taper appearing on Campagnolo cartridge-style bottom brackets.

I've never measured a cup/cone campag spindle having ISO dimensions.

Sugino Mighty (and Suntour Superbe and Sprint) were also identically ISO dimensioned, for whatever reason.

A good way to compare tapers in isolation is to set a caliper to 13mm and ten see how far past the end of the spindle that the jaws can slide.
This eliminates the need for accuracy (as when taking actual measurements of the width of the spindle at some fixed location relative to the end of the spindle as shown below).

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