I think you could evaluate how real the issue is by trying to measure actual tire runout versus rim runout, in both the lateral and radial directions. If the tire sidewall position isn't moving from side to side significantly, and if there aren't any radial lumps due to the tire, then I think the tire is probably on the rim correctly, and the variations you see in witness line and perhaps the color line are not significant.
For example if the rim is true and the sidewall is behaving not laterally true by a few mm, I think the tire has a real problem. If the sidewall lateral runout is anti-symmetric at teh same area of the rim, probably the beads are not right. If there is a symmetric bulge on both sides, probably there is a carcass problem. Just a thought - this is what I'd look for to see if what you observe represents a real problem, or if it's just what happens when we (I have a set, too) buy a good but cheap tire. On Fri, Jul 9, 2010 at 12:19 AM, Earl Grey <earlg...@gmail.com> wrote: > To follow up, > > I bought a floor pump, dismounted the tires, soaped them up, > remounted, overinflated, still the same variability. Dismounted again, > covered (dry) bead in baby powder, remounted, overinflated to about > 90psi, left overnight, still about 0.5mm variability in tire width > (between 34.7 and 35.2mm for the 35mm Pasela on Synergy OC, at about > 35psi). The "witness line" is still not even all the way around, > varying by about 0.5mm. I tend to think that this is variability in > the tire, and not poor mounting, but what do I know. I am fairly > certain this variability is completely inconsequential, I am just > surprised it exists. > > I would be curious to know any of you who pride themselves on good > tire mounting skills can measure similar variability in tire width. > > As I said, I don't want to make anyone paranoid, but it does perhaps > mean that if we want to communicate "actual" tire widths, that it > might be wise to measure a tire at multiple points (as well as report > tire pressure; when I inflated to 90psi, the tires widened by over > 1mm). > > Cheers, > > Gernot > > On Jun 23, 2:53 pm, Earl Grey <earlg...@gmail.com> wrote: > > Perhaps its time to invest in a floor pump...(I have one, a Silca, but > > it's currently on the other side of the globe...) > > > > And thanks for the talc tip. I religiously talc the inside of my > > tires, but never thought to apply talc to the bead. > > > > Gernot > > > > On Jun 22, 5:23 pm, Steve Palincsar <palin...@his.com> wrote: > > > > > > > > > On Tue, 2010-06-22 at 02:59 -0700, Earl Grey wrote: > > > > > > In the places where the measurements were smaller, I noticed that the > > > > slight ridge on thetirenear the bead (that presumably is there to > > > > let you gauge whether the bead is seated equally all around thetire) > > > > was partly buried under the rim, despite the fact that I pinched the > > > > tires near the rim when partially inflated to help seat the bead. > > > > > That's correct, and if yours is uneven you have a bead seating issue. > > > If hand manipulation doesn't work, try over-inflating, or try initially > > > using talc to assist in seating thetire. > > -- > 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-bu...@googlegroups.com. > To unsubscribe from this group, send email to > rbw-owners-bunch+unsubscr...@googlegroups.com<rbw-owners-bunch%2bunsubscr...@googlegroups.com> > . > For more options, visit this group at > http://groups.google.com/group/rbw-owners-bunch?hl=en. > > -- Ken Freeman Ann Arbor, MI USA -- 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-bu...@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.
