I heard that you often get this type of deformation by putting a Campy arm on a Shimano sized bb spindle. Many shadetree mechanics don't know that there are differences between BB spindles from different companies (I know I didn't when I got started). The taper angle is the same but the Shimano starts with a bigger cross section, and voila, one ham fisted mechanic and the Campy arm gets swaged to a bigger size. As OD Pergolizzi (Omnipotent Despot to us BVVWM'rs) says, you can either run a longer spindle, space out the fixed cup, or run it as a five speed. If you had a matched set that were both equally deformed, you could try mounting them on a Shimano BB and see if it lines up with the rear cogs and gives chainstay clearance.
No warranties expressed or implied on the safety of using an enlarged Campy arm under these circumstances. I just know some folks who have done it, and are still riding the cranks. I'd suggest starting with a 117mm BB if you're going to experiment.
Tom Adams, Shrewsbury NJ
>From: "John Pergolizzi" <jtperry1@verizon.net>
>To: "Angel Garcia" <veronaman@comcast.net>,<classicrendezvous@bikelist.org>
>Subject: Re: [CR]Campy Axle/Crank Spider Compatability Question
>Date: Sat, 27 Nov 2004 17:26:05 -0500
>
>Angel Garcia asked:
>"Still learning. I have two STRADA spiders with 170 cranks, one is
>early 70s
>(C in diamond) and the other is newer (9 in diamond). The newer one
>slides
>further onto the axle causing the small chainring to hit the
>chainstay; the
>older spider doesn't go as far and the small chainring clears. Are
>there
>differences or something wrong with the later one I have?"
>
>
>Angel,
> The tapers were the same, but if one of the previous mechanics
>had a miscalabrated arm, welll... then the taper is malformed (i.e.
>over tightened; NOT because of the use of grease on the tapers
>contrary to what certain manufacturers would like you to believe.
>Period. NON-debatable). Look inside after cleaning all the
>afterbirth off and see what's go'n on. Iffin things aren't nice and
>square, then she 's shot. But, If all else fails, use a triple axle
>or put a spacer between the fixed cup and b.b. Or shave the
>shoulders where the inner ring sits and now she's a "five speed"
>crank. COOL! You need about 1/8 inch min. clearance between the
>inner ring and stay to be kosher as everything will bend under
>stress.
>IMHO
>
>Have fun,
>John T.Pergolizzi
>Brooklyn, New York
>
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