Jan, Are you sure the tolerance is not +/- .05 mm, which is .002", rather than .005 mm? A tolerance of .0002" on tooth thickness would result in some very expensive chainrings, I would think.
Marc ________________________________________ From: rbw-owners-bunch@googlegroups.com [rbw-owners-bunch@googlegroups.com] on behalf of Jan Heine [hein...@earthlink.net] Sent: Monday, October 15, 2012 8:48 AM To: RBW Owners Bunch Subject: [RBW] Re: Chainsuck: why? Usually described causes don't apply. On Oct 15, 5:49 am, Michael Hechmer <mhech...@gmail.com> wrote: > I have had chain suck when I mixed shimano or shimano standard rings on a > sugino crank. A lot of inexpensive chainrings are made to somewhat loose tolerances. If your teeth are too thick, then the chain will stick once in a while. With 10- or 11-speed, the tolerances here are +/- 0.005 mm, and few of today's smaller makers can meet those demands. With Sugino moving the production of their less expensive cranks to China, I would not be surprised if their quality also had taken a further nosedive. Before we found a good supplier for the chainrings of our new Rene Herse cranks, we had to measure a lot of chainrings. (We even made a gauge so we didn't have to measure each tooth separately.) We were surprised by the variability that some makers had in their tooth thickness. Jan Heine Compass Bicycles Ltd. http://www.compasscycle.com Follow our blog at http://janheine.wordpress.com/ -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. To post to this group, send email to rbw-owners-bunch@googlegroups.com. To unsubscribe from this group, send email to rbw-owners-bunch+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en. -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. To post to this group, send email to rbw-owners-bunch@googlegroups.com. To unsubscribe from this group, send email to rbw-owners-bunch+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en.
