Here is a link to a website with some relevant discussion of 650B tire size: http://gearinches.com/blog/internet-goodies/650b-tire-diameter
in turn that has a link to a spreadsheet with some actual tire measurements: https://docs.google.com/spreadsheet/ccc?key=0AhJ3Eg2EndMUcFpsLUVBTm5XWWk3aGlEVXZfS2pvTHc&hl=en#gid=0 On Velocity Synergy rimes: Hetre's are 670mm OD; Pari-Moto's are 669mm OD; SOMA B-Line's are 656mm OD; Cypres 650Bx322 are 653mm OD. Has anyone measured OD of 700C tires that they could post for comparison? Nick On Thursday, October 24, 2013 9:29:20 AM UTC-4, Patrick Moore wrote: > > I may have proved empirically your rule of thumb. Can others chime in? I > didn't know that the width difference always equals the diameter difference. > > Had I done the math for the first example correctly, I'd have caught on > earlier. But still wonder if this is consistently true. > > As to narrower = higher, I've read that and seem to remember that I've > measured it, too. Must re-measure. Stretching the tire wider means that > there is less to go higher, but to rely on this would be to violate my own > "be empirical" maxim. > > > > > On Wed, Oct 23, 2013 at 9:53 PM, Bill Lindsay <tape...@gmail.com<javascript:> > > wrote: > >> >> >> Patrick, buddy. You'd be completely right except for a few small errors: >> >> >> On Wednesday, October 23, 2013 7:03:52 PM UTC-7, Patrick Moore wrote: >>> >>> The problem with this analysis is that the tire calculation is based on >>> width, not height. Height is also very much affected by rim width: a >>> narrower rim will give you a taller but narrower tire. >>> >>> That's false. Give one example you've measured where the same tire is >> taller on a narrower rim. It's just not the case. >> >> >>> FWIW, a 22 mm 559 tire measures just about 24" in diameter while a >>> true 35 mm one is about 25", very narrow rim, >>> >> >> A 35mm tire "should be" 13mm larger in RADIUS, and 26mm larger in >> diameter. You measure 1" difference in diameter. 26mm vs 25.4mm. I'd >> call that perfect agreement. >> >> >>> although 25-22 = only 3. >>> >> >> That's your typo. You meant to type 35-22 = 13 >> >> >>> Likewise, on the same very wide rim, the 55 mm (measured; labeled 50) >>> Furious Fred is 28.5" while the 61 mm (labeled 60) Big Apple Liteskin is >>> 20.25" >>> >> >> your typo, you meant to type that the Big Apple Liteskin is 29.25" >> >> >>> in diameter: 3/4" overall while the 60-50 route gives you 10 mm. >>> >>> 3/4" in DIAMETER is 19mm, or 9.5mm in RADIUS. 60 - 50 is 10mm in >> radius. Again, perfect agreement. >> >> >>> Best to get empirical measurements. >>> >>> >>> >>> -- >> 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-bun...@googlegroups.com <javascript:>. >> To post to this group, send email to >> rbw-owne...@googlegroups.com<javascript:> >> . >> Visit this group at http://groups.google.com/group/rbw-owners-bunch. >> For more options, visit https://groups.google.com/groups/opt_out. >> > > > > -- > *RESUMES THAT GET YOU NOTICED!* > Certified Resume Writer > http://resumespecialties.com/index.html > patric...@resumespecialties.com <javascript:> > http://www.linkedin.com/in/patrickmooreresumespec/ > > Albuquerque, NM > -- 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 http://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/groups/opt_out.
