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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

1965.0. "28 tooth cog Dura-Ace??" by SANCHO::HUFFAKER () Tue Jun 11 1991 16:16

    I know this sounds like sacrilege but has anyone tried to run a 28
    tooth cassette cog on a dura-ace drivetrain (7 speed sis)?  I know
    the following:
    
    * I am a wimp and am trying to save my knees on mountains.
    * that the 26 tooth cog is the max recomended for dura-ace.
    * that there is some margin in the dura-ace rear deraillier to go
      beyond 26 teeth.
    * that ultegra/105 cogs are interchangable with dura-ace.
    
    What I want to know :
    
    * anyone tried it before?
    * if so how did it shift?
    * anything special to be aware of?
    
    Thanks
    Mike
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1965.1WUMBCK::FOXTue Jun 11 1991 17:409
    
>    * that ultegra/105 cogs are interchangable with dura-ace.
    Is this true? I was leafing thru a Co. Cyclist catalog, and I
    thought it mentioned otherwise.
    
    More to the point, how about staying with a 26, and going to a
    39 up front?
    
    John
1965.2already at 39TEMPE::HUFFAKERTue Jun 11 1991 23:037
    I have already gone to a 39 front.  Funny thing you mentioned Colorado
    Cyclist, the person on the phone(at C.C.) when I was ordering some cogs 
    in the past said they were the same (they worked but then again I was 
    ordering dura-ace cogs, he said that was all they stocked but shipped 
    them to people who had ultegra).
    
    Mike
1965.3It works with 105SCRUTILE::MACFADYENSubtly modulated, richly texturedWed Jun 12 1991 09:026
    I don't know about Dura-Ace, but I have a 7-speed Hyperglide 12-28
    cassette that I use sometimes instead of the 13-23. With a Shimano
    105SC rear derailleur, shifting remains very crisp. No problems at all.
    
    
    Rod
1965.4TINCUP::MFORBESThis Space Intentionally Left BlankWed Jun 12 1991 10:036
re .3

I also use a 28 large cog with my 105.  The reason that it works fine is that
the 105 has a recommended msx cog size of 28 with a capacity of 28.

Mark
1965.5works fineTAHOE::BUCHANANBatWed Jun 12 1991 11:362
    I use that combination and it works fine.  I also use a 26 at times. 
    The cogs are interchangable.  The DA can only swing a 26 tooth cog.
1965.6One way to squeeze a tiny bit more out of the set-upCIMNET::MJOHNSONMatt JohnsonWed Jun 12 1991 12:095
    You may be able to use a 38-tooth chainring up front, if you switch
    brands.  I heard of one of our European colleagues doing this -- maybe
    he can elaborate.
    
    MATT
1965.7RUTILE::MACFADYENI feel better if my laundry's doneThu Jun 13 1991 05:2310
    Re .6:  Me, maybe. I have TA chainrings on my 105SC chainset, including
    a 38-tooth inner, which is absolutely as small as you can get on a
    Shimano racing chainset. The 105SC front shifter handles the 52-38
    shift with no fuss.
    
    Another advantage is the TA chainrings are much prettier than stock
    105SC chainrings, which are quite ugly.
    
    
    Rod 
1965.8and another thingIDEFIX::HEMMINGSLanterne RougeThu Jun 13 1991 06:477
re .7  Not to mention cheaper......

My second hand Shimano 600 has a TA 39 on it.  TA boast 5 (or is it 6?)
different pcd's - I have read the numbers, but what do they mean in terms of
what fits which?  I'd like a cheap alternative for Campag Chorus - �25 is a bit
steep.  Or again for Campag Sport - I know Campag rings last for ever, but do I
care about that??
1965.9Suntour Superbe 38 tooth chain ringTEMPE::HUFFAKERThu Jun 13 1991 19:206
    I have a Suntour Superbe 38 inner chain ring which I just put on.  Per
    Frank Berto's book "Upgrading.....(forgot the rest of the title)"
    It shows the Suntour as being harder than the Dura-ace.  Got it through
    a local bike shop.  Paid $19.00.
    
    Mike
1965.10EXPRES::HUIMon Jun 17 1991 14:207
    The book is called "Upgrading Your Bike". It does not cover the Shimano
    and Campy new stuff (Integrated 8, Double pulley brakes, etc... ) But
    it is a great book for bicycle gear heads. I read this thing from cover 
    to cover.
    
    Huey