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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 08-23-10, 06:48 PM   #1
Paultso
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cheap alternative for 151 bcd chainring? drill out a 144?

I got some old campy pista cranks that i want to use but the chainring is 151. All NOS ones are extremely expensive.

Would it be possible for me to buy a 144 bcd track chainring and drill the prexisinting holes into ovals so that theyll fit?
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Old 08-23-10, 07:09 PM   #2
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Unless you are super precise when you are drilling the holes...otherwise it is better off buying a new set of cranks.
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Old 08-23-10, 07:11 PM   #3
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Good luck with that. Unless you have access to a cnc machine, you'll end up with something that isn't concentric and / or loose and won't stay tight. Furthermore, the bolts will only contact a half circle and might bend or split the chainring. Anyways, you can get NOS 151 bcd Campy track chainrings for about the same money as modern Campy, Shimano, Sugino from places like Velomine >>> http://cgi.ebay.com/ws/eBayISAPI.dll...=263602_263622
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Old 08-23-10, 07:16 PM   #4
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Also, using a 151 bcd crankset will limit the choice of gear inches you are able to use.
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Old 08-23-10, 07:19 PM   #5
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Also, using a 151 bcd crankset will limit the choice of gear inches you are able to use.
Not really. Other than a 42T or 43T, all other sizes are available.
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Old 08-23-10, 07:20 PM   #6
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Nawww, bad idea bro-bro.
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Old 08-23-10, 07:23 PM   #7
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Oh, I thought the difference would be larger...

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Old 08-23-10, 07:25 PM   #8
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The lug pattern is easy to dril.. Get a hunter and a laser.
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Old 08-23-10, 07:30 PM   #9
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njs-keirin.blogspot.com has some 151's for 58usd. I don't know what shipping is like from them or whether or not the are reliable but...
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Old 08-23-10, 07:42 PM   #10
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njs-keirin.blogspot.com has some 151's for 58usd. I don't know what shipping is like from them or whether or not the are reliable but...
dang brahs, looks like i'll have to shell out some dough for this vintage crap. i would just sell the cranks but i spent the weekend polishing em to a mirror finish blang blang biatches
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Old 08-23-10, 07:47 PM   #11
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blang blang biatches
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Old 08-23-10, 07:49 PM   #12
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If you feel like getting nostalgic they do have quite the inventory of used NJS partage.
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Old 08-23-10, 09:06 PM   #13
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It's actually not that big a deal to do, although a vertical mill (not a CNC machine!) or a drill press should be used. Some old-timers do this to Campy 44T 144bcd rings to use on 151 road cranks, as originall 144bcd 44T's are really expensive! Way more than the Pista stuff.

If you have 151bcd ring to use as a pattern to transfer on to the 144bcd ring it's really a pretty straight forward job.
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Old 08-23-10, 09:46 PM   #14
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couldnt i just use a dremel bit and gradually ovalized the holes?
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Old 08-23-10, 09:56 PM   #15
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couldnt i just use a dremel bit and gradually ovalized the holes?



you need round holes for the round bolts.
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Old 08-24-10, 04:40 AM   #16
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Oh my god, is it that difficult?

http://www.cycleunderground.com.au/chainringdesigns.htm

scroll down; choose from 12 designs, 3 or 4 mm plate, 3/32 or 1/8, plain finish, polished or anodized.


simplest version costs 50 bucks and shipping is ultracheap. I had mine shipped to the Low Countries for something like 5 dollars.
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Old 08-24-10, 09:59 AM   #17
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Oh my god, is it that difficult?

http://www.cycleunderground.com.au/chainringdesigns.htm

scroll down; choose from 12 designs, 3 or 4 mm plate, 3/32 or 1/8, plain finish, polished or anodized.


simplest version costs 50 bucks and shipping is ultracheap. I had mine shipped to the Low Countries for something like 5 dollars.
Word of caution. I bought some of their rings. Soft. Pretty. But soft.
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Old 08-24-10, 03:47 PM   #18
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Word of caution. I bought some of their rings. Soft. Pretty. But soft.
Oh, well that wasn't my experience and I had a ring made from the thinner 3 mm plate, coincidentally also a 151 bcd ring.
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Old 08-25-10, 10:52 AM   #19
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Oh, well that wasn't my experience and I had a ring made from the thinner 3 mm plate, coincidentally also a 151 bcd ring.
Mine was the thicker plate. 500 miles on my SS, and I saw visible deformation of the teeth. Such that, if I were to move the chain over 1-tooth the inner-plates would bind up on the deformed teeth. I had to file then down gently. Still works... now looking again for more back-up rings.
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Old 08-25-10, 12:40 PM   #20
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That doesn't sound good... I should say that I didn't put a lot of miles on it before I sold it to fund other projects, probably less than 500 miles. They do call it 'armour plate' aluminum. Thinking of having them make a ring for my Stronglight 49d crankset, may have to rethink.
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