Bike Forums - View Single Post - Triplize 151 BCD Crankset?

11-04-14 | 09:36 PM

#7

davester

Senior Member

Joined: Oct 2012

Posts: 2,722

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From: Berkeley CA

Bikes: 1981 Ron Cooper, 1974 Cinelli Speciale Corsa, 1975 Alex Singer, 2000 Gary Fisher Sugar 1, 1986 Miyata 710, 1982 Raleigh "International", 1985 Trek 720

Quote:

Originally Posted by Otis

It can be done the same way Campagnolo did the 144 BCD Record cranks. If you can locate the hardware, I can drill and tap the arms for you. Bob Freeman at the now closed Elliot Bay in Seattle I believe had the hardware in stock. If you are serious about getting it done PM me and I can check if he has the parts.

If you are using a period Campagnolo GS, Record, or NR RD you will need to add a longer cage. I think Bob has some aftermarket ones of those as well.

Hi Otis,

I talked with Bob Freeman a couple of months ago about tapping and adding an inner chainring to my campy cranks, and had been getting ready to send my cranks to him, but now I suddenly find out that he's retired. Bummer! However, I noticed that you mentioned above that you could do this. I have standard 144 BCD campy cranks and I want to add a third chainring. I've been trying to figure out what will work and also possibly keep my front NR derailleur. Here's my setup:

1981 Ron Cooper (bought new)
13-28 IRD freewheel
I'm currently running a modern triple 52-42-30 and modern triple front derailleur with an outboard bearing setup, but I want to dump it...it just doesn't look right on the Cooper. My preference is to triplize my old Campy NR crankset (approx 1972 vintage). It currently has 52-42 chainrings and I'd like to add a 30 or lower inner chainring. Thing is, I don't think the NR front derailleur can handle this big a jump. I'd be willing to drop to a 50 large ring to make this work, and I think the FD will probably handle a 50-42-30. Do you know if this would work, or could I go even lower (50-42-28?)

So, a lot of questions. Let me know if you can do this, how much you'd charge, and if Bob is still available to source the small bits that I need to make it happen. I can't send PMs because the forum requires that you have a post count above 50 to do so, which I don't have.

Thanks a lot.

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