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Campy BB options(6 posts)

Campy BB optionsCaseysdad
Sep 17, 2003 7:49 AM
I've currently got an '81 Colnago Super with a Campy AC-H BB that I'm getting ready to replace. (At least I'm assuming it's an AC-H, rather than an SC-S, as all of the specs I've seen indicate that that's standard with my Racing Triple cranks. What's the difference between the two, anyway?) If I were to upgrade my BB to Chorus or Record, is there any chance that I'd still be able to use my existing cranks? Probably not, but it never hurts to check.
re: Campy BB optionsbimini
Sep 17, 2003 9:50 AM
The AC-H is aluminum caps and hollow shaft. The SC-S is Steel and solid shaft. Same dimensions and interchangable. The SC-S is a little heavier and a little less expensive.

The Chorus/Record Standard BB shaft is 102 mm for doubles and an 111mm assymetrical for Record Triple Cranks. Will not work on the Racing Triple. The AC-h comes in 111mm for doubles and 115 mm (or is it 117mm) for triple. You need the AC-H 115mm for your racing triple.

If you do want the Chorus or record BB you must change to a Record triple, or a Chorus or Record Double. Pricey Solution. $20 for a AC-H BB or $300++++ for Chorus BB with Record Triple.

You may have interferance problems with the Crank or chain rings if you use the Chorus BB with the Racing Triple. At a minimum the chain line between the Chain rings and the rear will be off significantly.
Here is a link with a lot of answers
http://www.branfordbike.com/bottombr/bb1.html#item2
double check the spindle length for the racing triplestratoshark
Sep 17, 2003 10:04 AM
Per branford, the Centaur and Racing T triple are the same crank except for the labels. www.campagnolo.com specs state a Centaur triple can use a 111 or 115 AC-H bb depending on seat tube diameter. '81 frame probably has 1 1/8 seat tube, so check that out before buying. Or, measure the AC-H that you have now, and if the triple fits, there's your size.
re: Campy BB optionsCaseysdad
Sep 17, 2003 10:29 AM
Wow! Thanks for the excellent feedback. This is EXACTLY the info that I needed. It never ceases to amaze me just how consistently helpful and informed people on this board are.

I had pretty much reached the same conclusion regarding the Chorus/Record upgrade. $20 vs. $300 is one of those decisions that even a chronic component junkie like me doesn't need my (usually biking-supportive) wife to help me make. Particularly since this is just my temporary hold-over ride while my dream bike nest egg grows. But I digress...

Anyway, thanks again!!
re: Campy BB optionsBikeRider
Sep 22, 2003 10:48 AM
You could also buy a Phil Wood BB for about $90.
re: Campy BB optionsStmbtDave
Sep 22, 2003 2:39 PM
Another option for the Racing T is the Record Track Cartridge BB. Check Branford Bike http://www.branfordbike.com/bottombr/bb2.html#item3. It is 111mm, symetrical, 3 bearings, carbon fiber body, hollow spindle and works great with the Racing T.

Dave