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Availability of Better Wheel and Tire Sizes
In the 'Low Cost SWB Comments?' topic, Buck wrote:
Be aware that 451 rims mean being restricted to Schwalbe [Stelvio] or Primo Comets. I'm pretty sure that Kenda introduced a 451 Kwest late last year, but they no longer sell direct to dealers, and my distributor doesn't carry that size. There are a few other tires from other makers, but they all seem to be 28mm wide or so. I guess that's in keeping with the original concept of the 451mm rim, which is called a 20" although it's two inches larger than the (now) much more common 406mm (BMX) rim. The reason for that oddity is of course that US tire sizing is based on the rolling diameter, which for a 20"X1-1/8" (28X451mm) tire should be about the same as a 20"X2.25" (57X406mm). There is also a problem with availability of wide (18mm), eyeleted double-walled rims in the 451 size, which would (IMHO) be the best choice for rims for mounting wider tires. It would REALLY be nice if we recumbent riders had better options for wheels and tires between the 406 and 559 sizes. With reasonably standard (i.e., cost effective) gearing, the high gear of a bike or trike with a 406 drive wheel is typically less than 90 inches - 52T chainring X 18.5" to 19" actual tire diameter / 11T cog. With a 35 to 40 mm wide tire on a 451 rim and a 56T big ring, that could fairly easily be bumped to 105 inches. That's an important jump, since a lot of folks we ride with 'spin out' with an 85" top gear (80 RPM at 20 MPH). The availability of tires for the 507mm (wide 24") rim size is probably a little worse than for 451s, but that seems to me to be almost the ideal for a 'bent drive wheel. A common road triple (30-42-53) crankset with a 23" tire would give us a gear range of 20 to 110 inches. Yet, the wheel would be stiffer than a 559 (much less a 700C!), and for a tadpole rear tire size would not be the limiting item for rolling it into a small station wagon, for example. Anyway... two cents worth (or less) from my soapbox; thanks for your patience. Regards, Wayne |
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#2
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Availability of Better Wheel and Tire Sizes
Hey team -
Sorry for the extra message to you newreader types. I'm just bumping this thread back up in web-based archive ahead of the latest round of SPAM from the anonymous jerk, who will hopefully now consider his duty done till March at least. Please be patient and hang in there with us. Regards, Wayne |
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Availability of Better Wheel and Tire Sizes
"32GO" wrote in message oups.com... Hey team - Sorry for the extra message to you newreader types. I'm just bumping this thread back up in web-based archive ahead of the latest round of SPAM from the anonymous jerk, who will hopefully now consider his duty done till March at least. Please be patient and hang in there with us. Here is the first note of criticism I have ever heard from Wayne Leggett on the SPAMMING TROLL. Maybe there is some hope for this group yet! Regards, Ed Dolan the Great - Minnesota aka Saint Edward the Great - Order of the Perpetual Sorrows - Minnesota |
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