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On Sun, 26 Sep 2004 21:51:31 -0500, Jim Adney
wrote: On Sat, 25 Sep 2004 12:51:33 -0600 wrote: Yes, the bead diameter on on each flange should remain the same, no matter how fat the extrusion becomes as the die wears. But wouldn't an enlarged cross-section of the rim effectively narrow the rim, flange to flange? Sounds reasonable to me. Still it would only amount to a few thousandths of an inch, I would think. What I'm wondering is what happens to the effective tire circumference if it's mounted on a narrow rim versus a wider rim. I kinda-sorta think that a wider rim produces a smaller effective tire circumference. I understand your point, but I don't really know how the tire might respond to this. My first guess is that there would be an effect at the extremes, but that the effect would be nil in the range of intended rim widths. It would all depend on how the cord responds to this change. I'll have to think about this some more. - ----------------------------------------------- Jim Adney Madison, WI 53711 USA ----------------------------------------------- Dear Jim, Here's a link to a Sheldon Brown page, where some flange-to-flange rim widths are shown in a table near the bottom: http://www.sheldonbrown.com/tire-sizing.html The table suggests that 23 mm tires fit on 13-15 mm interior rim widths and that 25 mm tires fit on 13-15-17 mm rim widths. These 2-4 mm ranges amount to over 13-15% of the rim width spacing for 23 mm tires and 23-30% for 25 mm tires. It sounds as if the acceptable interior rim width can vary far more than any die wear. Mount a 25 mm tire on a rim with an interior width of 13 mm and then on a different rim with an interior width of 17 mm, and the measured circumference may vary significantly. (Well, significantly to those of us who believe that measured bicycle tire circumferences can be significant.) Carl Fogel |
#54
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On Sun, 26 Sep 2004 23:33:45 -0600 wrote:
It sounds as if the acceptable interior rim width can vary far more than any die wear. Yes, I agree. Mount a 25 mm tire on a rim with an interior width of 13 mm and then on a different rim with an interior width of 17 mm, and the measured circumference may vary significantly. We might actually find that the effective circumference was smaller at both extremes and largest somewhere in the middle.... - ----------------------------------------------- Jim Adney Madison, WI 53711 USA ----------------------------------------------- |
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