I have a few questions that I’ve been researching for a while with no resolution:
It seems that ideal tire pressure is based on everyone’s feel. There are a number of calculators, and I use a mix of the figures from this one: http://www.dorkypantsr.us/bike-tire-pressure-calculator.html 5 but I’ll see people say go as low as possible until the tire feels a bit…off. I think I know what that means, but I’m not sure, and testing a tire to go low as possible seems dangerous - you have to push the tire to know when the pressure is too low right, and the more you push it (high speeds, hard turns)…
It’s all very subjective and I don’t know if I’m doing the right things. I am fairly light (65KG) so I don’t ever need to run (25 and 28mm) tires at 100PSI so perhaps I’m lucky here.
Related to the above, people agree that tubeless lets you run lower pressure. But how much? All calculators I’ve found are for clinchers, I believe. Am I just testing these out until I “think” it’s good?
Should tubular tires be at the same pressure as clinchers? Technically, these are tires with tubes in them.
On Weight Weenies, I read someone saying that tire pressure should be based on the actual width when fitted on the rim, not spec width because the same tire on a wider rim has higher air volume. Thus, if I have a 25mm tire that stretches out to 30mm on a wide rim, I can use the tire pressure suggested for a 30mm tire. Is this true? I can’t wrap my head around this - a big bag should hold more air than a smaller bag no matter how how wide you make the smaller bag when you put air into it, right? If it’s true, that means I can get the comfort of a larger tire with the aero and weight benefits from a smaller tire if I put the tire on a wide rim and the tire is stretched out.
Wider tires have less rolling resistance at the same tire pressure, Ex. 28 @ 60 PSI has better RR than 23 @ 60 PSI. Although many suggest having PSI as low as possible without slippery/sluggishness in the tire, isn’t there a case to have the HIGHEST PSI you’re comfortable with to take advantage of this lower RR? For example, maybe my butt and hands can handle 80 PSI, so I should do that even if I feel sluggishness at 60 PSI.