this post was submitted on 19 Oct 2023
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Measure your actual tire width and make sure you use the correct total system weight (body, gear, bike, water, etc.) I use the calculator all the time but I haven't had it give me seemingly out of range answers like that before.
I've confirmed the tire width with calipers, and I overestimated the weight (added an extra 60lbs of load) to be on the safe side, but the number still look really low.
Even if I fiddle around with numbers, for example, increasing the speed from recreational to fast group ride, it changes the values by a half PSI.