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With tubes, things feel horrendously sketchy at that pressure
They do? I'm 65kg and I've run tubed 23mm tyres at 40psi, 25mm at 30psi, no problems (except potholes take them out). Might have something to do with modern tubeless rims being wider, making equivalent tubeless setups less likely to bulb and 'flop' when cornering.
Howard
Nothing to do with bottoming them out. At 112kg, I can run 25/28c road tubeless at 85-95psi which means that even if the brake track were to heat up the air inside quite substantially it wouldn't get to a dangerous pressure level.
With tubes, things feel horrendously sketchy at that pressure, soi have to run 25/28c tires at 110+ to stop squirm or tire flop while cornering. At that pressure I've had two blowouts on long descents.