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So... tube sizing for tires. It doesn't make sense. It's bonkers. It's BS and you know it. Here's why:
#1) Slash sizing. Why is a tube sized as "4.50/4.75". It can't be both 4.50 inches and 4.75 inches in diameter. Pick one. Unless we're abusing quantum physics for our tire tech now.
#2) The stupid size chart. Every website in existence has the same chart (e.g. https://www.motorcycleproducts.co.uk/tyreguide.php). The chart matches metric tire size (e.g. 120/80) with inch tube sizes (e.g. 4.25/4.50). The manufacturer of a tube I ordered had the gall to print it on the packaging. And you know what? This chart is grade A garbage. How do a 110/90 and a 120/90 use the same size tube? They're clearly different size tires.
#2 part b, because the chart is that bad) The stupid size chart, again. How does a 110/90 use a 4.50/4.75 tube? 110 millimeters is 4.33 inches. Why are we cramming 4.50 inches into what is, at absolute most, a 4.33 inch hole?
#2 part c, because this chart is seriously trash) why are there only like, 10 sizes on this chart? The size I want isn't here. Time to step it up, internet.
3) It's BS because I can't understand it. Anything I can't understand is evil and wrong. There are no exceptions.
Yeah, I haven't posted here in like a year, and I'm at best a terrible mechanic, but so what? I can do dank 2 inch wheelies sometimes (mostly by accident) so I'm basically the best. And my opinion counts more than yours.
So now here I am, trying to get tires onto some supermoto wheels on a WR250R, and here comes this BS, voodoo, black magic nonsense to make it IMPOSSIBLE to find tubes that fit. I'm gonna find the inventor of tube sizing and challenge them to a duel. If they're dead, then I'll settle for just yelling at their kids (grand kids? great grand kids?) about how terrible their ancestor was.
(I'm just playing, NESR.)