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Old 07-21-14, 07:17 AM   #1
jonwvara 
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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.

Attached Images
File Type: jpg Stronglight chainring guard small.jpg (94.3 KB, 41 views)
File Type: jpg Triplized double from behind.jpg (96.8 KB, 54 views)
File Type: jpg Triplized double mounted.jpg (108.5 KB, 69 views)
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Last edited by jonwvara; 07-21-14 at 07:28 AM.
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Old 07-21-14, 07:38 AM   #2
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Very nice work.
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Old 07-21-14, 08:26 AM   #3
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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.
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Old 07-21-14, 08:38 AM   #4
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Dang...you planning on climbing walls with that? Nice work.
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Old 07-21-14, 10:15 AM   #5
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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.
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Old 07-21-14, 11:20 AM   #6
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Quote:
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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.
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.
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Old 07-21-14, 07:38 PM   #7
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Dang...you planning on climbing walls with that? Nice work.
No just hills in the great North East Kingdom.!
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Old 07-22-14, 08:52 AM   #8
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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.
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Old 07-22-14, 11:00 AM   #9
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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.
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