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Conference noted::bicycle

Title: Bicycling
Notice:Bicycling for Fun
Moderator:JAMIN::WASSER
Created:Mon Apr 14 1986
Last Modified:Fri Jun 06 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:3214
Total number of notes:31946

654.0. "CHORUS 'A' vs CHORUS 'B'" by USMRM2::PJOHNSON () Mon May 09 1988 13:19

    I bought the Campy Chorus group a few months ago and need to know
    about the 'A' and 'B' settings on the rear derailleur.  I currently
    have a Regina chain and a 13-15-17-19-21-23 Regina freewheel and
    cluster.  I have a Suntour 14-16-18-20-23-26 freewheel and cluster 
    sitting at my work bench.  Can I switch to the Suntour freewheel, 
    and if so, should the derailleur be set to 'B'?  What range is appro-
    priate for the 'A' setting vs. the 'B' setting?
           
    Regards,
    Phil
T.RTitleUserPersonal
Name
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654.1One answer; several questionsBRMUDA::MJOHNSONTo code is human; to hack, sublimeMon May 09 1988 13:4411
    The A setting is 5 degrees; the B setting is 30.  I bet that
    the B setting would be reasonable for BOTH of your freewheels.
    A is for really close-ratio gears--13-21 or tighter.
    
    By the way, could you share your experiences with Chorus?  I'm
    very interested in the components.  At first glance, they seem 
    to be some of the best designed pieces I've seen.  Do they seem
    to be holding up?  How does the derailleur action compare with
    others you've used?  What did it all cost?
    
    MATT
654.2here's one for ChorusUSMRM2::PJOHNSONMon May 09 1988 14:3223
    I'm completely happy with the Chorus group and after about 1000
    miles they seem to be holding up fine.  The seat post, pedals, and 
    hubs are nice.  The brakes and crank set are awesome.  The derailleur 
    is much better than what I had been using (Nuovo Record c.1974), but
    I must say, I recently shifted a brand new Dura Ace system (7-speed)
    and it was even better in my opinion.  All of the Chorus components
    are beautiful to look at (my wife thinks I'm crazy about this) and
    are cold forged so they're very strong.
    
    Forget about Campy Synchro if you're really interested in indexed 
    shifting.  I used it with the Chorus group for about two weeks but
    it just wasn't that accurate when down shifting from certain gears.
    The shifters allow you to turn off the index shifting and set it
    to friction, but that mechanism sort of gets in the way when in
    friction mode.  So anyway, I returned the Synchro shifters and got 
    a pair of C-Record shifters at no extra charge from International 
    Bicycle in Brighton.
                        
    I'd be happy to try to answer any specific questions you may have
    about Chorus.
    
    Regards,
    Phil
654.3Nah, 12 - 16 5-speed is "TIGHT" !MENTOR::REGMay Be ('til June 1st)Tue May 10 1988 21:317
    re .1	13 - 21 is "tight" ?
    
    	Maybe I'm missing something, but that's just all the odds or
    something close, i.e. 13,14,15,17,19,21.  How is that "tight" ?
    
    	R
    
654.4Writing for the ReaderCIMNET::MJOHNSONTo code is human; to hack, sublimeWed May 11 1988 09:586
    Ease up. From the perspective of somebody who has only 13-23 and 
    13-26 cogs, 13-21 would seem "tight."  13-21 happens to be the 
    widest ratio gears I own, and what I guess would be the limit
    of what you should use with a 5 degree setting on the Chorus.
    
    MATT
654.5With 7 its "tighter"CREDIT::HOLDENWed May 11 1988 10:123
    13-21 is also tighter if you admit to having 7 cogs.  I'm
    currently using a 13-20 and its pretty damn tight,
    13-14-15-16-17-18-20.
654.6Tulio told me himselfUSMRM2::PJOHNSONWed May 11 1988 11:4811
    I spoke with Guy at International Bicycle and he read me the Campagnolo
    spec's over the phone.  According to Campy, the 'A' setting on Chorus
    is appropriate if the cluster range (large - small) is less than 12.
    So my 13-23 would work best on the 'A' setting since the pulleys are
    closest to the sprockets on 'A'.

    I went home the other day and tried the 'B' setting.  It didn't
    seem as smooth when I tested it on my work stand.  I'd still like
    to test it on the road if it ever stops raining.
    
    Phil                    
654.7OK, how about 12-18 7 speed (44/53 front :-^)) ?MENTOR::REGMay Be ('til June 1st)Wed May 11 1988 19:556
    Well, of course I was only kidding, add wry grin type smiley faces
    as you see fit.
    
    	R	{and yes, I DO admit to pushing a stack of 7, well its
    		still early for me}
    
654.8chainsSTAR::MCCARTHYThu May 12 1988 09:308
    
    
    	I will be purchasing the Chorus Group soon and the freewheel
    that I am interested in is the Regina America 7 sp. What chain
    do you other Chorus users find best. The Regina CX-S supposedly
    is the choice for 7speed Campy derailleurs, what do you use???
    
    Joe
654.9SEDISPORT / CHORUSUSMRM2::PJOHNSONThu May 12 1988 09:594
    I use a SEDISPORT narrow chain.  It seems to work fine with my Chorus
    group.
    
    Phil
654.10USE SEDISPORTAKOV11::FULLERThu May 12 1988 10:589
    I have a seven speed setup with a Record C crank and rear derailleur.
    The Regina CX-S chain caused me problems of the chain falling off
    the front chainring when the chain is in the lowest gear.  Campy 
    chainrings are very beefy, and the CX-S chain is inflexible, as a 
    result the chain kept falling off.  I called the Campy hotline and 
    they said they use Sedisports on their own bikes.  I changed to the 
    sedisport and it works fine.
    
    steve
654.11Need Campy Hotline number!!!CSC32::KILEYTue May 24 1988 19:1810
    What is the Campy hotline?  I am trying to find a Chorus crankset
    in a "small" size. 165 or 167.5.  I believe that Campy makes this,
    but it is not sold in the U.S.  maybe this hotline could help me
    locate one.
    
    
    Laurie Kiley
    CSC32::kiley
    DTN:  522-4473