The Stronglight triple axle is marked "125" although the "123" axle might work on many frames.
A TA 374 axle would be a good bet also.
It is really wise to do gear charts before embarking on these efforts. You may want to do a half step plus granny and the 52-45 might be better with a three or four tooth gap.
Joe Bender-Zanoni Great Notch, NJ
Rich Pinder wrote:
> I picked up a Stronglight crank a while ago after someone mused about
> the possibilities of converting it into a triple.
> It has a 'protective' ring that sits in front of the large ring. So
> there are positions that three rings could mount.
> The name on the back of the crank is 'Modelo Depose' - and I see
> reference on the net to this name being also in the '93' family. BCD
> is 71.7.
> Sheldon's page mentions that Stronglight rings in this size go down to
> 38 teeth (yes ?) - my current rings are 52/45.
> If anyone has a used (or new) STRONGLIGHT ring, I'd appreciate it.
> Here's a picture to compare with: *http://tinyurl.com/b5jjk*
> Has anyone ever tried to convert such a crank over to a triple??
> Would there be a BB / Axle that would compensate for the spacing
> changes ?
> Appreciate any thoughts you could give.
> Rich Pinder
> Van Nuys, CA