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Old 05-28-18, 12:51 PM
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Changing tire pressure does different things to the wheel.

Decreased pressures soften bumps transmitted to the spokes. (Good for spokes.)

Increased pressures decreases spoke tension uniformly. (Could be good or bad depending on start tension.)

Increased pressure makes the rim more rigid. (Definitely good for spokes as spoke wear and breakage comes from tension changes as the wheel rolls across the contact patch.)

Of the three, increased pressures making the rim flex less strikes me as having the greatest effect on wheel life since road bumps aren't going to affect momentary tension variations to the extent that the contact patch does. So if you want to run lower pressures, it is best done with a larger volume tire to keep the same sort of net force on the rim.
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