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Old 01-26-09, 05:19 PM   #1
steve-d
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Campy bb new vs old: are tapers the same?

Wanted to know if I can use an older bb w/a newer crankset.

S
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Old 01-26-09, 07:41 PM   #2
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The tapers ought to be the same, but the offset has changed several times over the years.
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Old 01-26-09, 07:46 PM   #3
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Phil Wood tells us that the "taper" was changed post '93...but I think it was size of spindle ends rather than taper degree, since 2 seems standard regardless of ISO, JIS, or Campy. Phil also muddles what they call the different standards as they long had a "splits-the-difference" size that was sort of universal, at least until Campy did whatever in '93.
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Old 01-26-09, 07:55 PM   #4
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Yeah a new campy square taper is considered JIS now.
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Old 01-26-09, 08:03 PM   #5
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Now color me confused. I thought JIS was different vs Campy (IS0)?

I have a newer Campy crankset hung onto this older bb spindle. It immediately showed a slight eccentric travel.

I'd like to eliminate the possiblilites.

This is just presenting further possibilites.

Steve

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Old 01-27-09, 09:41 AM   #6
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Both ISO and JIS tapers are two degrees. JIS spindles are bigger at the small end. Using the wrong one won't cause "eccentric travel".
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