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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 03-15-09, 08:42 AM   #1
Batavus
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Campagnolo Pista 151 crankset; chainline 45 mm?

Uhm that about sums it up. I have this crankset coupled with the original cup and cone pista BB, but the chainline with a 3 mm thick 3/32" chainring comes in at 45 mm exactly. WTF? did Campagnolo change to the standard 42 mm after abandoning 151 BCD?

Using a Phil wood double fixed with Surly cog and a Sturmey Archer 1.6 mm spacer and I still need to go 1 mm outboard with the cog, but my lockring is only barely holding on with 2 or 3 threads engaged, so I'm not putting an extra spacer in there. Nothing serious, it just sucks not to have that chainline perect.

Does anyone else have experience with the 151 BCD crankset?
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Old 03-15-09, 09:00 AM   #2
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No. Here's the chainline diagram from catalog 15 (1967), well within the 151mm BCD timeline:



Are you certain you have the proper bottom bracket:


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Old 03-15-09, 11:19 AM   #3
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Thanks a lot! My spindles says 68 p120 I think, but I'm not sure. Will take it out and measure. Thanks again!
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Old 03-15-09, 12:08 PM   #4
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Originally Posted by Batavus View Post
Will take it out and measure.
The diagram indicates a 120mm bb for 42.5mm chainline. Also make sure you got the iso bb.
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Old 03-17-09, 01:45 PM   #5
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My spindle measures 109 mm as per the diagram. It reads: 68 P 120 Z Very odd.I think the number 120 refers to the rear OLD, not spindle length. I have a normal 68 mm BB shell. Using 10, 1/4 inch loose balls per side. It ticks all the boxes, very strange.....
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Old 03-17-09, 02:23 PM   #6
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My spindle measures 109 mm as per the diagram. It reads: 68 P 120 Z Very odd.I think the number 120 refers to the rear OLD, not spindle length. I have a normal 68 mm BB shell. Using 10, 1/4 inch loose balls per side. It ticks all the boxes, very strange.....
Perhaps this might help?
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Old 03-18-09, 02:50 PM   #7
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Thank you John, for all the tech info!

I have checked everything; my frame is straight, everything is installed correctly. I am stumped. the only thing I can think of is that the BB cups are thin-walled whereas thick-walled cups would put the spindle a couple of mm inboard and I would have extra thread showing on the left, adjustable cup, or am I talking nonsense here?
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