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Old 12-26-07, 04:47 PM   #1
gregg-o
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Campy pista cranks

What years did the campy record track cranks use the 151 bcd. I am trying to date them and there are no marking. They just say pista 170 on the back. I know some have numbers by the pedals on the crank arms. These have no markings at all. Just curious if any one can help that would be great.


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Old 12-26-07, 04:58 PM   #2
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Here is a suggestion...Post a pic! no just kidding. If you search google you will find printable paper rulers in the millimeter format. I would suggest printing and cutting a few. The paper is nice and pliable so you can get it close to the circles for a fairly accurate measurement. You will be off by a few mm...but it should be able to tell you what you have. If it is the 151 I would only keep them if this going on something that requires this period correct item to match the OEM bicycle. Otherwise use a set of 144 for easy parts sourcing.

Good luck.
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Old 12-26-07, 05:04 PM   #3
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I think Campagnolo used a 151 pcd from 1958 to around 1968. i have a 165mm pista pair myself with no other markings.
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Old 12-26-07, 05:18 PM   #4
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I think the 151 track cranks continued to exist much longer than the road cranks, probably into the mid-70s because trackies already had the chainrings! Sugino made them in 151 as well.
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Old 12-26-07, 06:46 PM   #5
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i've read that about 1972 and earlier for the pista cranks. 68 and earlier for the road cranks. then you can probably give or take a few years too.
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Old 12-26-07, 08:15 PM   #6
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I think the 151 track cranks continued to exist much longer than the road cranks, probably into the mid-70s because trackies already had the chainrings! Sugino made them in 151 as well.
Shimano's EX track cranks of the 1970's were also 151bcd. That would most likely be the reason both Shimano and Sugino continued to make 151bcd chainrings well into the 80's.
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Old 12-27-07, 12:07 AM   #7
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Originally Posted by SoreFeet View Post
If it is the 151 I would only keep them if this going on something that requires this period correct item to match the OEM bicycle. Otherwise use a set of 144 for easy parts sourcing.

Good luck.
151 chainrings pop up often enough on the bay. If you've got this crankset all set up, why mess with it?
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Old 12-27-07, 08:22 AM   #8
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I just got a '76 Paramount P-14 that has the 151bcd Pista cranks. I assume they are the originals, but who knows.
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Old 12-27-07, 10:09 AM   #9
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151 chainrings pop up often enough on the bay. If you've got this crankset all set up, why mess with it?
One possible reason to mess with it: check the point where the spider joins to the crank on the drive side. These sets were apparently notorious for developing slow failures at that point ... well, slow in the development, but spectacularly fast in the critical stage. The cracks will first appear as small hairlines. If they're there, it's time to retire the set.
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Old 12-27-07, 10:25 AM   #10
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One possible reason to mess with it: check the point where the spider joins to the crank on the drive side. These sets were apparently notorious for developing slow failures at that point ... well, slow in the development, but spectacularly fast in the critical stage. The cracks will first appear as small hairlines. If they're there, it's time to retire the set.
i think all the campy cranks of this style (144 or 151 bcd) can develop cracks. filing and smoothing those really sharp cast edges in that area should keep cracks from forming.
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