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regarding the calculator - i find it interesting that it recommends lower pressures for XC type riding than enduro type riding. typically i run 20/18 on rocky/enduro stuff and 24/21 on more XC type stuff.
That’s ass backwards. And, I’m talking about a big saggy ass.
 
The biggest issue is getting people to honestly assess their own riding style and assigning a factor to that.

There are 240 lbs dudes who run <20 psi in their 29x2.4 EXO tires without issue. There are 140 lbs dudes who can peel tires off the rim at 25 psi.

I have no issues with new riders starting out using a calculator but ultimately you should just do some testing and find out what pressure works for you. Trying to make the perfect pressure calculator isn't that useful.
+1

Its more a ballpark/starting point that one should experiment from. I remember busting balls of guys in our group who ran DD tires... for the most part I was riding the same stuff. Sure enough, as I've progressed I've needed to run higher pressure and now myself run DD/DH tires.

Northeast rider, 195 lb geared-up, 35 lb enduro, Conti DH tires, I'm generally at 26/28 psi for proper smashing and sometimes up to 28/30 for certain shuttles/parks. In the wet I'll drop it 24/26 psi.

I basically run similar pressures on my trail bike, with lighter casing tires, but I'm also a bit less hard charging on it. For a very mellow trail/XC, kid shotgun ride I could run 20/22 psi.

The WT app is pretty close, seems like the terrain is more akin to "charging", cause jumps gives me my normal pressure.
 
That’s ass backwards. And, I’m talking about a big saggy ass.
i guess i typically think of XC as not being very rough, and wanting to run higher pressure to reduce the rolling resistance. i guess it probably greatly depends on the ride (as usual). kind of a compromise between draggy saggy tires and not getting bucked off every bump.
 
I input my hardtail specs into the Wolftooth and 5 othe "bicycle tire pressure calculator" apps. Results are all over the place with Silca being by far the most extreme outlier. WTB seems to be closest to my real world preference of 18/20.

FRONTREARVARIANCE FROM MEDIAN
SILCA1010.5-9
WOLFTOOTH1718.9-1
WTB1719-1
ENVE2021+1
SRAM21.522.9+3
CSBIKES23.625.1+5
 
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