Originally Posted by
MoAlpha
Missing from all of this discussion is internal rim width. It's critical to effective tire volume, which, in turn, is critical to minimum inflation pressure.
Good point.
When I plugged in the numbers at
https://axs.sram.com/guides/tire/pressure I used 17 mm as the internal rim width.
That gave the 64/68 psi recommendation
For 15mm rim width, the pressures recommended are 67/71 psi.
So not a big difference, but the trend is clear.