I recently found a rider-quality SunTour XCM triple drive side crank I plan to use for a future build. It's 110/74mm BCD. Here's a photo:



From the logo, based on SunTour catalogs available at the Disraeli Gears website it appears to be a 1991 model.

I'm pretty sure this crank was used in both double and triple configurations. Unfortunately, so far I've been unable to find spindle length info for this crank for either double or triple chainring configs. The last SunTour catalog I've been able to find that gave spindle length info was from the mid-1980s (also on the Disraeli Gears site).

From that mid-1980s reference, I'd guess 117mm for double and 125mm for triple configs. But I really don't know.

Can any of our SunTour experts either (1) point me at a definitive source that would tell me those spindle lengths, or (2) tell me from personal experience what length works, preferably for both 2x and 3x? The 2x info is more critical, as I'll likely be setting it up that way initially.

Thanks in advance for any advice.