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On those very wide rims, you needn't even pump them up to 120psi, hell even 90psi is enough.
I also had the ZTR Crest which have a claim 50psi (I think) max, yet ran 25mm at 80psi previously and was fine, abet I drop it a lots lower to 60psi rear because 80psi was much too firm.
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DT Swiss 29'er disc rims claims a max pressure of 60psi. Now I am building these up, give them 120psi in a 23c tyre
Broadly speaking, if you halve the tyre cross sectional diameter, you can double the pressure
https://en.wikipedia.org/wiki/Cylinder_stress#Thin-walled_assumption
This probably breaks down when your tyre narrower than the rim, but it's close enough given the safety factors involved, as long as you don't mind explosions and death. Unhooking the tyre with lateral loads becomes less likely with higher pressure, as the tyre deforms less and the normal force between the tyre and the rim is higher, so there's more friction.
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edscoble
gbj_tester
@Thuekr
Mythbustin' time - DT Swiss 29'er disc rims claims a max pressure of 60psi. Now I am building these up, give them 120psi in a 23c tyre + the same number of bunny hops and see if the lateral pressure can make the side rim give birth to unclinching.
http://www.allterraincycles.co.uk/DT-Swiss-465D-29er-Disc-Rim