I also ran a AT triple with a UN72 127mm bb. I don't recall needing a spacer as it was on my '83 Stumpjumper that had excellent ring clearance, no bowed stays. It was perfectly centered. The tread width was still very low compared to anything "modern". I still have it around so maybe later I'll measure it uninstalled, a hand press as Ray did. In riding the extra length spindle made no difference to me. In a blind test I would not be able to tell a difference. Years later I'm riding a 170mm tread width triple and even that makes no difference to me.
On Sunday, April 25, 2021 at 7:59:14 PM UTC-4 Ray Varella wrote: > Joe, > I just measured the Sugino AT on a 127mm spindle. I get 153mm without > cinching the bolts down. This is just a hand press fit with a gentle tap to > make sure they are on straight. > Since you want a wide range double, I’m assuming you plan on using the > inner ring. > By eliminating the inner ring and running a compact double that would > allow running a narrower Q > > I don’t think most modern cranks will improve on that for you. > > Hope that helps > > Ray > > On Sunday, April 25, 2021 at 4:18:43 PM UTC-7 Joe M. wrote: > >> Ok thanks for everyone's input this is helpful. I'll look into making >> these work. >> >> But if anyone does have a wide range double they'd part with, I'd still >> be interested in possibly purchasing it. >> >> On Sunday, April 25, 2021 at 4:09:55 PM UTC-7 Patrick Moore wrote: >> >>> Bob; It all comes down to arm flare. I got 160 mm Q with a Sugino XD2 >>> and 113 mm spindle; I got a 160 mm Q with a TA Pro 5 Vis and a custom 145 >>> mm spindle. >>> >>> On Sun, Apr 25, 2021 at 5:02 PM Bob Lovejoy <[email protected]> wrote: >>> >>>> I am not expert enough to explain where the differences come from, but >>>> different cranks use different bb spindle lengths to get the same >>>> configuration. The Sugino AT's just happen to use a relatively long >>>> spindle but once installed they clear the chainstays exactly as they >>>> should. That said, being a triple, the Q factor is going to be more than >>>> a >>>> double. >>> >>> -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/rbw-owners-bunch/a4711887-a687-49d9-ae0e-24859e5e30fdn%40googlegroups.com.
