Be cautious when using published tire width sizes to make assumptions about how accurate they aren’t. I think in the Road biking world, especially, these numbers are pretty accurate. But as tires get wider, they seem to be fairly fluid; some much more than others. While the BSD has to be accurate for a tire to fit the rim, width sizes are often “inflated” or otherwise inaccurate. The only way to really know is to try the tire on the rim in question and pump it up to “working” pressure.
Speaking of BSD (bead seat diameter of a rim), we moved toward it for a while in unicycling, but then away again. The problem is, very few rims have the BSD marked on them. And more tires do, but not all. So there’s no way to confirm a legal-sized wheel at the track. So for now, we’re still using “the box”, a box that’s the specific size of maximum diameter. If your wheel fits in without rubbing, it’s legal. Some day we might return to BSD for wheel sizes in some events, but probably not Track, where the diameter is crucial.
Endlessly. Hopefully the new definitions will stand the tests of time better…
As mentioned earlier, the actual side-to-side width is not restricted, but that number also approximates the “tallness” of a tire above the rim. A larger “width” makes for a larger diameter. Very few 24" tires are actually 24" in diameter! The old Schwinn tires were pretty close. The Miyata tires were smaller, and the old 3" Gazzalodi tire on my Wilder Muni was close to 26".
Basketball and Hockey use a less restrictive size for their 24" wheels, in order to accomodate the thicker tires that are common among players, and also common in the shrinking market for 24" tires. I recently had a bit of a panic when I couldn’t find ANY decent tires online to use as a replacement on my old Miyata. UDC only had a Muni tire, and Amazon had a slightly knobby one that probably wouldn’t roll as well. Everything else was too thick for the Track! If that trend continues, we may have to relax the maximum size for Track, but this will upset a lot of people because the older speed records would lose their status of currency. One by one they would fall. But isn’t that what records are supposed to do, be broken?
That would be the last thing unicyclists would want. Well, maybe Track racers; a pretty serious bunch. But the main restrictions for Track are maximum wheel diameter and minimum crank length. When we started adding races for other unicycle types (Muni and Road) we tried to avoid restrictions in order to let the riders, and the market, figure out what works best. So Muni and Road unicycles have less restrictions on them, whereas Track racing wants a more level playing field.
Absolutely! Especially if it’s far enough that you flew your unicycles there. That’s why we have to be very specific about those dimensions in the Rulebook. I’ve seen many people find out the hard way that their tires were a tiny bit too big (usually skinny 26ers), or a lot too big (the basketball-type tires).
I thend to agree with you. But people are nit-pickers. Also, sometimes we have to change things to fit the “now”, like a dwindling market for 24 x 1.75" tires, for example.