I just measured one arm, not guaranteed to be typical. Distance from outside edge of arm to outside edge of bolt hole varies from 3.1 to 3.7 mm. On a random (53 th) nearly new chainring, from inner edge of ring to inner edge of bolt hole ran about 2.4 - 2.7 mm.
Your millage may vary.
harvey sachs mcLean VA
Jerome & Elizabeth Moos wrote:
> If the smallest Stronglight mod 93 ring is 38T, it must be because the
> distance from the inside edge of the ring to the bolt hole is larger
> than necessary, like for a 151 Campy ring compared to a 144 Campy.
>
> Regards,
>
> Jerry Moos
>
> HM & SS Sachs <sachs@erols.com> wrote:
>
> Jerry Moos wrote: Yeah, if a 130 BCD Dura Ace will take a 39T, a
> 122 BCD
> Stronglight ought to go lower than 38T. And, Bob Hovey wrote:
>
> >
> >
> >
> I distinctly remember putting a 36 on my 93.
>
> #######
>
> Just a couple of observations: Not only does Sheldon Brown declare
> 38 as the minimum, but so does Sutherland IV. That takes care of
> authority, w/o even checking Cyclo-Pedia.
>
> So, I got out a Stronglight 93 arm and an available 36 tooth
> (Campy, from the ugly triple) to eyeball the things. If someone
> were willing to do almost anything to get a 36 to run on a
> Stronglight, it would be possible. Of course, you would have to
> grind off the tops of the arms, down to just about the top of the
> chainring bolt hole (<1 mm clearance). Then find a ring that would
> sit on the arms - oddly enough, the Campy 36 is pretty close,
> maybe half a mm too big i! n radius.
>
> For all that, the Stronglight 99 and its clones (86 mm BCD) do
> turn up occasionally, and have much greater flexibility.
>
> Good luck!
>
> harvey sachs
> mcLean va
>
> _______________________________________________
> Classicrendezvous mailing list
> Classicrendezvous@bikelist.org
> http://www.bikelist.org/