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Rivendell tire TPI?
All the talk about tires lately got me wondering about the threads per
inch in the casings of Rivendell tires. Anyone know the TPI for the Roll-y Pol-y and/or Ruffy Tuffy? Thanks, Jim Rogers |
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#2
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Rivendell tire TPI?
In article ,
Jim Rogers wrote: All the talk about tires lately got me wondering about the threads per inch in the casings of Rivendell tires. Anyone know the TPI for the Roll-y Pol-y and/or Ruffy Tuffy? Why not ask Rivendell? They'll know. |
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Rivendell tire TPI?
These wonderful tires should not be judged by "normal" tpi numbers as they
use a kevlar wrapped thread in the casing. It's just Apples and Mangos. Tom -- Bruni Bicycles "Where art meets science" brunibicycles.com 410.426.3420 Paul Southworth wrote in message ... In article , Jim Rogers wrote: All the talk about tires lately got me wondering about the threads per inch in the casings of Rivendell tires. Anyone know the TPI for the Roll-y Pol-y and/or Ruffy Tuffy? Why not ask Rivendell? They'll know. |
#4
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Rivendell tire TPI?
Why not ask Rivendell? They'll know.
They're a small operation and I hate to tie up their staff for a question to which someone here might know the answer. (Sure enough, when I called to ask, the guy was away from the phone for awhile getting the answer.) The answer-- 127 TPI for both. Another question-- anyone know if the "extra roundness" of their tires is the real deal or just a marketing angle? Are they really any (or much) rounder in cross-section than other tires? If so, does it really make that much difference in their performance? --Jim |
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Rivendell tire TPI?
Jim Rogers writes:
They're a small operation and I hate to tie up their staff for a question to which someone here might know the answer. (Sure enough, when I called to ask, the guy was away from the phone for awhile getting the answer.) The answer-- 127 TPI for both. I doubt it after seeing the claims of other tire brands that bounce all over the range and Continental's claims that are obviously not threads per inch... but could be filaments in the threads, something we haven't previously counted. Another question-- anyone know if the "extra roundness" of their tires is the real deal or just a marketing angle? Are they really any (or much) rounder in cross-section than other tires? If so, does it really make that much difference in their performance? Please clarify. To what roundness does this refer? Tire circumference or tire cross section and how do they claim they measure this? A tire that is out of round goes lump-lump-lump ad you coast down a smoothly paved road so that isn't a problem with any tires I have ridden. Cross sectional roundness is a function of inflation. An inflated tire has a round cross section unless it is a belted radial tire as on cars. Jobst Brandt |
#6
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Rivendell tire TPI?
On Tue, 11 May 2004 18:33:06 GMT,
wrote: Jim Rogers writes: Another question-- anyone know if the "extra roundness" of their tires is the real deal or just a marketing angle? Are they really any (or much) rounder in cross-section than other tires? If so, does it really make that much difference in their performance? Please clarify. To what roundness does this refer? Tire circumference or tire cross section and how do they claim they measure this? A tire that is out of round goes lump-lump-lump ad you coast down a smoothly paved road so that isn't a problem with any tires I have ridden. Not their claim. Cross sectional roundness is a function of inflation. An inflated tire has a round cross section unless it is a belted radial tire as on cars. Jobst Brandt This is it... http://rivendellbicycles.com/webalog...bes/10033.html "3. It has a round cross section for good cornering. They are rounder than any other tire, and as a result we haven't ridden a better cornering tire. The extra degree of roundness comes from a three part mold, instead of the usual two part mold, which most modern road tires have...." I had some WTB Slickasaurus tires- 26"x 1.5" - that had almost an egg-shaped cross section. Round on the outer/tread side (although maybe not 'rounder'? Cut about a third off of an egg from the pointed end and what's left is the idea of the cross section. Would tread design and application of the tread affect the cross section of the tire? When you say all non-radial belted tires have a round cross section, is this on the interior and can be changed on the exterior through treading? |
#7
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Rivendell tire TPI?
"Jim Rogers" wrote in message Another question-- anyone know if the "extra roundness" of their tires is the real deal or just a marketing angle? Are they really any (or much) rounder in cross-section than other tires? If so, does it really make that much difference in their performance? My original Ruffy's are "rounder" and a bit bigger then the spanking new Ruffy's I just received, one of which I just put on the front of my Heron. It's seemingly taller as well, probaly a result of not as round and slightly smaller (diameter). The new one's measure slightly over 27mm though. Steve B. |
#8
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Rivendell tire TPI?
Dan Daniel writes:
Another question-- anyone know if the "extra roundness" of their tires is the real deal or just a marketing angle? Are they really any (or much) rounder in cross-section than other tires? If so, does it really make that much difference in their performance? Please clarify. To what roundness does this refer? Tire circumference or tire cross section and how do they claim they measure this? A tire that is out of round goes lump-lump-lump ad you coast down a smoothly paved road so that isn't a problem with any tires I have ridden. Not their claim. Cross sectional roundness is a function of inflation. An inflated tire has a round cross section unless it is a belted radial tire as on cars. This is it... http://rivendellbicycles.com/webalog...bes/10033.html Wow what a bunch of double-talk. Of course a 700-28 is smaller than a 700-32 so what else is new. Besides: :1. Sizewise, it's big (think "round and rolly") with larger air : volume than most any tire near 700x28. It's smaller than the : comfortable and fast 700x32 Avocet slick, and since the Avocet is : too big for most modern short reach (compact) brake road frames, : our Roll-y Pol-y couldn't be that big; and yet, with a name like : Roll-y Pol-y, it is fatter and more round than any other tire : close to its size. The designation on the sidewall is 700x28 due : to some Japanese law we're told, but it measures a true 27mm wide : on most road rims. Either they are using the correct tire cross section size or they aren't. Rolly poly or not it cannot have a larger air volume than any other 28c tire unless the casing has zero thickness. Tread thickness does not factor into the 28 of 28mm cross section, only the casing OD when inflated and that is always round, as I explained above. "3. It has a round cross section for good cornering. They are rounder than any other tire, and as a result we haven't ridden a better cornering tire. The extra degree of roundness comes from a three part mold, instead of the usual two part mold, which most modern road tires have..." Oh hogwash! The roundness comes from basic physics of an inflated inelastic thin walled tube. That is what a bicycle tire casing is and all of them have a round cross section. Tread rubber can be formed to other shapes as we see in knobby tires but the tire IS round in cross section. There is no way they are more or less round. On top of that, the part smooth and part cosmetically micro-ribbed tread does nothing for traction and as the ad copy states, it tries to satisfy those who want slicks and those who want patterned tread. Well that tells me they don't know the difference. I had some WTB Slickasaurus tires- 26"x 1.5" - that had almost an egg-shaped cross section. Round on the outer/tread side (although maybe not 'rounder'? Cut about a third off of an egg from the pointed end and what's left is the idea of the cross section. Your shape was in the tread, not the tire casing and the thinner the tread the less that part of the tire will deviate from perfectly round. Would tread design and application of the tread affect the cross section of the tire? When you say all non-radial belted tires have a round cross section, is this on the interior and can be changed on the exterior through treading? The casing will be round. Obviously you can stick a number of odd shapes on top of that but the only way it will remain round is with NO tread rubber. Jobst Brandt |
#9
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Rivendell tire TPI?
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