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  1. #1
    Senior Member jebensch's Avatar
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    122 BCD - are there granny rings out there?

    I'm going to rebuild my Peugeot grocery-getter to serve as my toddler-whisk-a-rounder. It's currently built as a single speed with Stronglight 93 crank that I'd love to keep on there, but I want to have a granny gear on this thing.

    Is there such thing as a 26-ish tooth ring in a french 122 BCD? I suspect there isn't, and it will save me the headache to use a Campy or Japanese double if I want the granny.
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  2. #2
    can't member Noah Scape's Avatar
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    I have a 38t and I think that is about as small as you can go with 122.

  3. #3
    Ellensburg, WA scozim's Avatar
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    Quote Originally Posted by Noah Scape View Post
    I have a 38t and I think that is about as small as you can go with 122.
    Same here - Verktyg was selling a few last year. It's actually been a nice combination with the 52-38.
    1984 Gitane Sprint; 1984 Gitane Tour de France;1982 Trek 610; 1980's Univega Supra Sport; 1975 Teledyne Titan;1984 Peugeot PSV10N; 1968 Peugeot PL8; ;1982 Nishiki Marina 12; 1977 Peugeot PX-10; 1987 Trek 800 Antelope (touring/commuting set up); 1981 Trek 510; 1993 or 1994 Scott Comp Racing mtb; 1996 Klein Pulse II mtb; 1980's Peugeot Limestone hybrid;

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  4. #4
    Senior Member southpawboston's Avatar
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    Yep, 38T is the smallest for that crankset, and it can be made into a triple or double with the appropriate bolts. With an appropriate freewheel, you can get pretty low gearing with a 38T front ring.

  5. #5
    Old fart JohnDThompson's Avatar
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    Quote Originally Posted by southpawboston View Post
    Yep, 38T is the smallest for that crankset, and it can be made into a triple or double with the appropriate bolts. With an appropriate freewheel, you can get pretty low gearing with a 38T front ring.
    Actually 37T was the smallest ring made for 122mm BCD, but they're even harder to find than Campy's 41T 144mm BCD rings.


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    If you want to go with a granny ring on a C&V Stronglight crank, look into the model 99. When I hear "granny ring" I think of a triple ring crank. not just a sub-42 inner ring on a double. The 99 will take a true granny ring. You just can't do it on a 93.

  7. #7
    Gearhead old's'cool's Avatar
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    Quick calculation reveals that the pitch diameter of 26T is approximately 105mm. You probably need about 12.5mm between the pitch dia and the bolt circle, so I estimate the maximum BCD for 26T is around 80mm. By the same token, I estimate 36T is about the smallest you can go with 122mm BCD. That is in rough agreement with comments above.
    Last edited by old's'cool; 01-08-12 at 09:56 AM.
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  8. #8
    Senior Member jebensch's Avatar
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    I suppose I could hunt down a 38 inner and then build a freewheel cluster with some lower gearing. Unless of course, in a moment of weakness I misplace some cash on one of those pretty Gran Cru TA copies.
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  9. #9
    Wrench Savant balindamood's Avatar
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    To stay sort original, you may need to switch to one of these, or the Stronglight or Sugino equivalent:



    The Stronglights are uncommon, but obtainable, the SR's are more rare, and the Suginos are impossible to find (although I don't know why you would be looking for one). They all use the obsolete 86mm BCD which will let you get down to a 28T.
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