Originally Posted by
Branko D
Sounds like tire pressure is best matched against known tire size and (typically) known road quality, and erring downward is preferable to erring upward. Still, it doesn't support running sub 100 psi pressures on narrow 25 and 23mm tires.
Don't assume those PSIs on the chart mean anything other than in whatever test protocol they used. In fact, it's easy to get a lower pressure recommendation from the
data-backed Silca tire pressure calculator.