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  1. #1
    Senior Member jonwvara's Avatar
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    Super-compact Stronglight 93 double

    I'm not sure this will interest anyone other than me, but I recently put together an ultra-compact double on a Stronglight 93 crank by bolting a 28-tooth 74 BCD ring to a 42-tooth triplizer ring and mounting it in the inner position on the crankarm, with a homemade chainring guard in the outer position. The bottom bracket setup was the same as for any triplized model 93. The photos below show the setup pretty clearly, I think.

    I made the chainring guard by hacksawing the teeth off a worn-out and cosmetically challenged 47 tooth ring and smoothing the cut surface with a double-cut file followed by a single-cut file and some fine emery cloth. I came out looking very neat--unless you look very closely you'd think it had been done on a lathe. You can see in one of the photos that the cut-down 47-tooth ring is just the right size to cover the 42-tooth triplizer without interfering with the front derailleur.

    It looks pretty good to me, and it shifts very well. That surprised me a little because the curvature of the Suntour Vx front I'm using isn't a very close match for the 42-tooth ring. Maybe that's not as important as I'd always thought.

    I now have a 13-15-17-19-21-24-28 freewheel on the back, mainly because I had one lying around. That only gives me a high of about 86 gear inches, which is a little low even for me. I may ask Pastor Bob to build me a freewheel with a 12-tooth small cog--something like a 12-14-16-19-22-26-30. Another option would be a new DNP freewheel with an 11-tooth cog. But from what I've heard, the quality of the DNP freewheels isn't very good and an 11-tooth cog would give me a 102-inch high, which is more than I need.

    A slightly pointless project, maybe, but kind of fun. I've always liked wide-range doubles, and this one seems to work really well.

    Stronglight chainring guard small.jpgTriplized double from behind.jpgTriplized double mounted.jpg
    Last edited by jonwvara; 07-21-14 at 08:28 AM.
    www.redclovercomponents.com

    "Progress might have been all right once, but it has gone on too long."
    --Ogden Nash

  2. #2
    Senior Member vonfilm's Avatar
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    Very nice work.
    1973 Schwinn Super Sport
    1986 Schwinn Peloton
    1987 Schwinn Super Sport frameset
    1976 Raleigh Super Course Mk II(for wife and son)
    1990 Davidson Impulse
    1990 Mongoose IBOC
    1995 Montague(BMW branded) folding mountain bike
    1999 Montague(BMW branded) folding mountain bike

  3. #3
    Senior Member
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    very nice jonwvara!

    thanks for sharing this creation. most handsome.

    btw - wrt small c/w's for stronglight chainsets: beginning in 1978 they offered a special outer adaptor c/w for the 49D that is drilled to accept model 99 c/w's. this allowed an all-stronglight 49D with c/w's as small at 28T.

  4. #4
    If I own it, I ride it CV-6's Avatar
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    Dang...you planning on climbing walls with that? Nice work.
    Lynn Travers

    Photos

    ISO: Lejeune Champion du Monde Ultra Leger Reynolds 753, 53-55cm

  5. #5
    feros ferio John E's Avatar
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    The only thing I would do differently would be a half-step-plus granny, with something like a functional 45 or 46T chainring in the outer position.
    "Early to bed, early to rise. Work like hell, and advertise." -- George Stahlman
    Capo [dschaw'-poe]: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger, S/N 42624
    Peugeot: 1970 UO-8, S/N 0010468
    Bianchi: 1981 Campione d'Italia, S/N 1.M9914
    Schwinn: 1988 Project KOM-10, S/N F804069

  6. #6
    Senior Member jonwvara's Avatar
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    Quote Originally Posted by John E View Post
    The only thing I would do differently would be a half-step-plus granny, with something like a functional 45 or 46T chainring in the outer position.
    I agree, that would be a great setup. I doubt that there will ever be enough demand for 45- or 46-tooth triplizers to justify the cost of making them, though.
    EDIT: Oh, I misunderstood your point--you're talking about setting up a 46-42-28 triple, not a 46-30 double or whatever. I'm kind of slow on the uptake sometimes. The double can't be done with the now-available triplizer, but the triple certainly can. I've run that exact setup very effectively--in fact, that's how the Gitane in the photo was set up before I went to the 42-28 I'm using now.
    Last edited by jonwvara; 07-21-14 at 12:26 PM.
    www.redclovercomponents.com

    "Progress might have been all right once, but it has gone on too long."
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  7. #7
    Freewheel Medic pastorbobnlnh's Avatar
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    Quote Originally Posted by CV-6 View Post
    Dang...you planning on climbing walls with that? Nice work.
    No just hills in the great North East Kingdom.!
    Bob
    Dreaming of Summertime in NH!

    Visit my websites:
    FreeWheelSpa.com orpastorbobnlnh.com

  8. #8
    feros ferio John E's Avatar
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    Quote Originally Posted by jonwvara View Post
    I agree, that would be a great setup. I doubt that there will ever be enough demand for 45- or 46-tooth triplizers to justify the cost of making them, though.
    EDIT: Oh, I misunderstood your point--you're talking about setting up a 46-42-28 triple, not a 46-30 double or whatever. I'm kind of slow on the uptake sometimes. The double can't be done with the now-available triplizer, but the triple certainly can. I've run that exact setup very effectively--in fact, that's how the Gitane in the photo was set up before I went to the 42-28 I'm using now.
    Yes, 45-42-28 or 46-42-28 is precisely what I had in mind, depending on the progression on the freewheel. At one time, using long stack bolts and a 110mm BCD crankset (no triplizer needed), I made a nice close-ratio half-step and granny: 48-45-34 / 13-15-17-19-21-24.
    "Early to bed, early to rise. Work like hell, and advertise." -- George Stahlman
    Capo [dschaw'-poe]: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger, S/N 42624
    Peugeot: 1970 UO-8, S/N 0010468
    Bianchi: 1981 Campione d'Italia, S/N 1.M9914
    Schwinn: 1988 Project KOM-10, S/N F804069

  9. #9
    aka Tom Reingold noglider's Avatar
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    Quote Originally Posted by CV-6 View Post
    Dang...you planning on climbing walls with that? Nice work.
    Wall is not a bad word for the hills of Vermont, except it makes them sound easier than they are. They are both steep and tall.
    You don't read my signature anyway, do you?

    Tom Reingold, noglider@pobox.com
    Residences: West Village, New York City and High Falls, NY
    Blogs: The Experienced Cyclist; noglider's ride blog

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