Dura Ace 144 chainring doesn't fit very well on my old 144bcd Campy pista crank
05-29-21, 08:23 AM
#1
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Dura Ace 144 chainring doesn't fit very well on my old 144bcd Campy pista crank
I can get it to fit sort of, but I think I need to file a bit. Would you file the crank seats a little or the ring. I am thinking filing the chainring seats a bit to it will smoothly fit.
I thought this was going to just be a super easy job. lol. Gotta love the old vintage stuff when you need to repair something.
Thoughts?
I thought this was going to just be a super easy job. lol. Gotta love the old vintage stuff when you need to repair something.
Thoughts?
05-29-21, 09:15 AM
#2
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...I can only go from personal experience, but 144 BCD as a standard has worked fine for me in all the chain ring swaps I've done between manufacturers (Sugino had 144 as their standard for their Campy imitation, the Mighty Comp for a while, and I've used the Suntour Superbe144 rings on Campy without issues. Can't recall using the Dura Ace rings ? ) My only thought is there might be something else going on. I don't do a whole lot off track chainring swaps, so I'm not much help here.
Are the holes in the old and new rings both drilled with a recess for the seat ?
...I can only go from personal experience, but 144 BCD as a standard has worked fine for me in all the chain ring swaps I've done between manufacturers (Sugino had 144 as their standard for their Campy imitation, the Mighty Comp for a while, and I've used the Suntour Superbe144 rings on Campy without issues. Can't recall using the Dura Ace rings ? ) My only thought is there might be something else going on. I don't do a whole lot off track chainring swaps, so I'm not much help here.
Are the holes in the old and new rings both drilled with a recess for the seat ?
05-29-21, 09:28 AM
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The flange radii are different. Shimano even has this problem with some 104 mm MTB rings.
05-29-21, 09:32 AM
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Would you agree with my direction?
Picture added to show the crank with old chainring.
Last edited by h_curtis; 05-29-21 at 09:36 AM.
05-29-21, 09:49 AM
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If it were me, I'd set aside that Dura-Ace and get a Sugino Mighty or 75, SunTour, Campy (or probably a host of others; TA?, Zeus?). I have a Sugino 75 crankset and swap between Campy and Sugino and cannot tell which I've got without looking,
I use little Shimano simply because they love to do things slightly differently so you cannot quite swap cleanly.
I use little Shimano simply because they love to do things slightly differently so you cannot quite swap cleanly.
05-29-21, 10:00 AM
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From what I have been reading people make it work with some filing. I wanted to buy a "round" chainring as an improvement. I guess if I am filing that might change things in that department, but I will try and be consistent with each mounting point.
Would you agree with my direction?
Picture added to show the crank with old chainring.
05-30-21, 05:34 AM
#7
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File the ring, it's the wear part and will eventually have no value unlike the crank.
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05-30-21, 03:46 PM
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The guys in the last shop where I worked would spend the time filing the inside of the rings to fit the Shimano cranks. I was lazy, and I also had a problem taking a file to brand new parts, so I'd just order the correct ring. I could tell if the ring would work by looking at the picture.
In your case the correct ring isn't readily available, so I would have no problem taking a file to the one you have. And, yeah, as someone already mentioned, Sugino rings are compatible with Campagnolo.
In your case the correct ring isn't readily available, so I would have no problem taking a file to the one you have. And, yeah, as someone already mentioned, Sugino rings are compatible with Campagnolo.
06-26-21, 02:05 PM
#9
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I filed the ring, new chain and had to get a new rear Euro Asia cog for the rear. It has never been this nice. All 1/8" front and rear. Should have taken a picture before I rode it 50 miles or so, but it is smooth and looks good when it is clean. lol
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06-26-21, 04:08 PM
#10
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