Originally Posted by
Hondo6
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 ... 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.
Not a "Suntour Expert" but shouldn't really matter as that's a Sakae (SR) crank. Not a Sakae Expert either, so there is that...
1990 Schwinn Voyageur picked up this past spring had a Sakae XCE crank, with a absolutely useless BB. BB spindle had posts like the ones for the XCE and XCM in hazelnutguy's reply here:
Originally Posted by
hazetguy
From a Suntour '90 Model Bicycle Components Features & Specifications catalog:
...
Measuring excluding the bolt post things yielded 125 mm and so used a 127mm BB-UN55 had laying around. Chainline's perfect for the triple. Have no experience with a double.
From hazyguy's data sheet, the XCM is takes a BB spindle 2mm or so shorter then the XCE, so perhaps you can extrapolate to like 122.5 for the triple and 115 for the double?
Good luck!