Do you have the original rings on the crank? Mixing Shimano rings and Sugino cranks, or vice versa, can cause spacing problems. It is possible the crank was set up with a 1 or 2 mm spacer beneath the middle ring. This is often needed to avoid jamming between the middle and small rings, but may be causing a problem for you. Checking this is not hard but requires a few special tools - pedal wrench, bolt extractor and 5 mm allen wrench. You need to remove the pedal, the crank arm and the small ring to get at the big-middle combo.
Michael On Wednesday, February 19, 2014 1:07:23 PM UTC-5, Jim Bronson wrote: > > I am having some problem with my chain jamming when I downshift from the > big ring to the middle ring on my Sugino XD600. I have been observing > this, and it appears what is happening is the chain is wrapping completely > around the pin that is supposed to facilitate upshifting. > > Now, the XD600 is said to support 7/8 speed, and I am running a 9 speed > drivetrain, but from everything I've always read on here, it shoudn't pose > an issue. Perhaps it is the chain I am using? It's a SRAM PC971. I was > thinking of trying a KMC or Shimano chain just to see if it eliminates the > problem. > > I really like this crankset otherwise, the 46/36/26 works really well for > the riding I do. I just think the jamming is potentially hazardous. For > now, I just really ease off the pressure when shifting chainrings, and then > if it does jam, it doesn't throw me for such a loop. > > Any advice? > > -- > Keep the metal side up and the rubber side down! > -- 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 post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/groups/opt_out.
