bike wrench

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A place to ask bicycle repair questions, and for bike shop monkeys to share advanced non commercial wrenching resources (no YouTube self promotion). This is only for repair related topics.

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About Silca's tire pressure calculator (lemmy.ca)

submitted 10 months ago by [email protected] to c/[email protected]

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Has anyone applied the pressure recommendations given on Silca's site: https://silca.cc/pages/sppc-form

From what it tells me, I can safely put in 30 to 33 PSI of pressure in my Schwalbe Marathon GT 365 tires (26"x2") on poor roads. This would be below the min 35 PSI listed on the tire, and about 20 PSI lower than what I've ever run them at.

I'm not too terribly worried about punctures, but do worry about pinch flats.

Thoughts?

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[–] [email protected] 1 points 10 months ago (1 children)

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.

[–] [email protected] 1 points 10 months ago

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.