Classic & Vintage - Is it possible to use a modern symetrical bottom bracket with Campy NR cranks?
Bikeforums.net is a forum about nothing but bikes. Our community can help you find information about hard-to-find and localized information like bicycle tours, specialties like where in your area to have your recumbent bike serviced, or what are the best bicycle tires and seats for the activities you use your bike for.
11-10-07, 10:58 PM
I did a search or two but came up empty. Is it possible to use a modern symetrical Campy bottom bracket with pre-date code NR cranks designed for an asymetrical spindle? I'm guessing that 115 mm might work. Thanks.
11-11-07, 06:28 AM
In my case, yes. I had to replace an old offset 112mm english threaded NR bottom bracket with a new campy veloce 111 mm, italian threaded. It was ~2mm too short for the frame I was using. Switched to a new veloce 115mm and everything lined up well. If the cranks you are using are older you can probably tighten them inwards further than if they were new, due to wear and tear.
11-11-07, 03:45 PM
Thanks, norskagent. I just bought a NOS campy BB on ebay for $35.00, so I think I'm covered. Nevertheless, this information is good to know. So, if anyone can share their experiences with cartridge BBs used with Nuovo Record cranks, it would be appreciated. Thanks.
03-18-11, 11:11 PM
for C-Record strada/road cranks, you can use the modern centaur 111mm *symmetric* BB and it works perfect. same ISO taper, same spindle length, same symmetry as the orginal C-record cup-and-cone BB. lickton's calls it the "2008 Centaur 111mm" model, part#s: 0205-13 (eng) and 0205-15 (ita). this is the BB i installed on my somec with c-record cranks...works PERFECT!
i'm trying to figure out if the equivalent 115.5mm centaur will work with Nuovo/Super Record cranks. nuovo record BBs are ~115mm assymetrical and ISO tapers, with the longer spindle-end on the drive-side. the centaur spindle length looks right (enough, within ~1mm overall) and the ISO tapers are right, but i believe the 115.5mm centaur is also symmetric so you'll need some BB spacers to shift everything over to the drive-side. however, i dont have the difference in length between the drive- and non-drive sides of the nuovo record BB spindle to know how wide the spacer needs to be...DOH!
edit: based on the documentation i found here: http://www.minortriad.com/campagbb.html
a 68mm english nuovo record BB is 115.5mm overall with 49mm on the drive-side and 33.5mm on the non-drive (part# 744/A 68 SS). that's a difference of 15.5mm in spindle-end lengths. you'd need half of that in the form of a spacer to shift a symmetric BB over to the drive-side...15.5mm / 2 = 7.25mm thick spacer. say 7mm is close enough for gubment work.
7mm seems somewhat wide for a BB spacer, you're giving up alot of important threaded interface in the BB area. i'm reluctant to think this is a really workable retrofit. i might try it out and see how it works...
edit #2: i re-read that documentation and the spec i was using was for an older BB. the latest nuovo record BB spec is in chart-3 "new style". the nuovo record double BB is nominally 113.5mm long assymetric (28mm + 54mm + 31.5mm). and looking at the differences in spindle-length, it only has 3.5mm of assymetry.
so...going back to the symmetric 115.5mm centaur cartridge bb...dang, it's still not going to work, since the long spindle-end is on the fixed-cup side and you cant thread it in any further to "give" the extra length to the non-drive side. dang.
Powered by vBulletin® Version 4.1.12 Copyright © 2014 vBulletin Solutions, Inc. All rights reserved.