How low can I go (tire pressure)

[SCOOBYDANNN]

like it says

How low can I go on 37x12.50's on 16.5x6.75 rim. the rim has a small bead rim, but not quite as big as the 15 and 16" rims.

 

[juanblzer]

I've aired down with 16.5s to about low 20s. My problem was rubbing rocks and actually peeling the steel rim away from the bead and losing air. Nothing a BFH couldn't repair on the trail. I do know that 1 pound of pressure is too low on a 16". I usually pull the valve stems on my 36x12.5 16"s and just let them go until they look right. Well, Driver's front was too low and slipped off the bead. First time for everything though.
Juan