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Campagnolo chainring quality

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Campagnolo chainring quality

Old 10-06-11, 04:43 PM
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toosahn
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Campagnolo chainring quality

I have a 78' Vintage Campagnolo Super Record Strada crankset on my Mikkelsen. The finish on it, is fantastic, however I've noticed that the chain rings themselves are kinda "wobbly" or warped. I'm used to chainrings being slightly out of round, but the later movement makes it very difficult to tune the front derailleur (as it will rub with very little tolerance).

Is this just another charm of vintage components or should I be looking into replacements?
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Old 10-06-11, 05:20 PM
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Chombi
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Wobbly? What causes that? Heat treatment?
I'm surprised to hear that this happens with Campagnolo rings, I never had the problem with all the Stronglight, Mavic, Gipiemme and TA rings I owned so far they were all straight when I adjusted them against all my FDs.....

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Old 10-06-11, 05:26 PM
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Things get bent and bumped once in a while. If one knows how, it can be made straight, depending on how bad it is. Be carefull, if it's aluminum, bending too many times can break it.
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Old 10-06-11, 05:43 PM
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toosahn
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The "wobble" or lateral movement is only a few mm.
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Old 10-06-11, 05:59 PM
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Originally Posted by toosahn View Post
The "wobble" or lateral movement is only a few mm.
These parts are from 1978? And are Super Record, which especially in the 42t small ring is quite cut back in the material dept. Time for some NOS "Nuovo" Record units, the extra material makes for quite a stiffer part. The inner web of the 42t on a "Nuovo" Record ring even is connected between any two of chainring bolts.

If it was new stuff, it would be quality, for stuff 30+ years old... plenty of potential use or abuse, weather on a bike or on display in a shop.

No note that 42t 144 BCD rings sell for a premium on ebay, of any style. bigger rings fetch much less. I have worn some out, but that has taken a long long time. Much less time for Sugino or SR Brand. Not sure how the TA ones hold up.
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Old 10-06-11, 06:36 PM
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It sounds like your crank arm's spider got bent at some point. One or more spider arms are out-of-plane. It happens. You will likely need to straighten it (carefully). The special tool that I use for that process is a medium-sized rubber mallet....

("Don't force it, get a larger hammer!") :-)
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Old 10-07-11, 02:07 AM
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I'll try the rubber mallet. I tested it today with a coin on the bottom bracket and the spider is definitely out of line.
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Old 10-07-11, 04:22 AM
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OK. The ghost of Tullio is awaiting an apology for kicking dirt on his chainrings.

Let us know how the spider straightening went.
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Old 10-07-11, 08:04 AM
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Originally Posted by toosahn View Post
I'll try the rubber mallet. I tested it today with a coin on the bottom bracket and the spider is definitely out of line.
Details on how you used the coin? I have a bit of runout (probably ~1-2mm) on my NR crankset, and when I put the rings on a glass tabletop, they appeared to be flat.
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Old 10-07-11, 11:07 AM
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toosahn
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Just lay a quarter on top of the bottom bracket and move it close enough to the crank surface to barely touch. Then, kinda like checking to see a wheel is out of true, listen for unevenness when you turn the cranks. I'm not sure how to check it higher up on the spider though.
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Old 10-07-11, 11:10 AM
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Originally Posted by rootboy View Post
OK. The ghost of Tullio is awaiting an apology for kicking dirt on his chainrings.

Let us know how the spider straightening went.
Very well said!
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Old 10-07-11, 11:43 AM
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Originally Posted by toosahn View Post
Just lay a quarter on top of the bottom bracket and move it close enough to the crank surface to barely touch. Then, kinda like checking to see a wheel is out of true, listen for unevenness when you turn the cranks. I'm not sure how to check it higher up on the spider though.
Ahh, gotcha. Yeah, to check it further out you would probably need one of those magnetic stands like I've seen used with dial indicators. Something like this.
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