Good point; definitely a question of tolerances; up for debate whether a matter of QA.
On Sat, Sep 2, 2017 at 1:18 PM, Peter White <peterjwh...@gmail.com> wrote: > I'd say it's a judgement call whether or not it is a quality control > issue. In manufacturing, you always set a standard for precision. Take > chains. Modern bicycle chains are ½ inch pin to pin. Are they exactly ½ > inch? How do you define "exactly?" To what tolerance? If you set the > tolerance to within a certain number of atoms, say three atoms, and if you > could actually produce them to that degree of precision, you would get > really precise chains. But does a bicycle chain have to be produced to that > degree of precision? We all know the answer. > > With a rear derailleur, the chainring can work perfectly well with more > runout than would be acceptable on a track bike. And the runout that's > acceptable on a track bike used for a local club race would probably not be > acceptable to a top professional competing at the world championships. > > PJW > Peter White Cycles > > On Sat, Sep 2, 2017 at 7:50 PM, Patrick Moore <bertin...@gmail.com> wrote: > >> Thanks, all. I'm going to replace this 48 with another that I have, and >> hope that the other one is more "true." >> >> And: if anyone has 3/32 * 48 t 50.4 bcd rings to sell or trade -- *in >> very good condition, please!* --please lmk. >> >> * I use 9 speed chains 'cuz I use Dingle cogs. >> >> Peter: Then the upshot is that these old rings are just often out of >> round -- poor quality control? I've noticed some runout on the many other >> Pro 5 Vis rings (all older ones) that I've used for fixed gear drivetrains, >> but never to the extent of this one. >> >> Makes me wish I still had my 20 lb box of Stronglight 49 cranks and rings >> ... I've notice slight runout with Stronglights and other cranks and rings, >> but not as with TA and certainly not as with this particular ring. And, >> it's the ring; the 46 t ring, also older Pro 5 Vis, that this 48 replaced, >> didn't have nearly the this degree of runout. >> >> On Sat, Sep 2, 2017 at 5:30 AM, Peter White <peterjwh...@gmail.com> >> wrote: >> >>> Rotating the ring will make no useful difference, though it will tell >>> you how much of the runout is in the ring and how much is in the crank. >>> >>> While the Pro 5 Vis crank can be used as a single speed, it was never >>> intended for use without a chain tensioner, which rear derailleurs include >>> by default. So TA doesn't need to be very precise in centering the ring or >>> the crank itself. >>> >> >> >> Justin: I don't get it: it's not bent, it circumferentially eccentric -- >> as many of the others I've used are, too; just a lot more so. >> >> On Sat, Sep 2, 2017 at 6:49 AM, Justin Hughes <justinhug...@me.com> w >> rote: >> Right. That's one reason why SS intended rings are thicker and stiffer, >> right? >> >> >> Brian: it's rather new, in fact; age and wear is not the problem. >> >> On Sat, Sep 2, 2017 at 11:17 AM, Brian Campbell <bdcampbel...@gmail.com> >> wrote: >> >>> Simply time for a new chainring. Things do eventually wear out and have >>> to be replaced or discarded. I consider it a positive outcome when if comes >>> to bikes. >>> >>> -- >> 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 rbw-owners-bunch+unsubscr...@googlegroups.com. >> To post to this group, send email to rbw-owners-bunch@googlegroups.com. >> Visit this group at https://groups.google.com/group/rbw-owners-bunch. >> For more options, visit https://groups.google.com/d/optout. >> > > > > -- > Peter White > > -- > 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 rbw-owners-bunch+unsubscr...@googlegroups.com. > To post to this group, send email to rbw-owners-bunch@googlegroups.com. > Visit this group at https://groups.google.com/group/rbw-owners-bunch. > For more options, visit https://groups.google.com/d/optout. > -- Resumes, LinkedIn profiles, bios, and letters that get interviews. By-the-hour resume and LinkedIn coaching. Other professional writing services. http://www.resumespecialties.com/ www.linkedin.com/in/patrickmooreresumespec/ Patrick Moore Alburquerque, Nouvelle Mexique, Vereinigte Staaten ************************************************************************** ************** *Auditis an me ludit amabilis insania?* -- 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 rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at https://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout.
