Ive gone down to 4psi......
but that was on a mil 110... same size rim and rubber tho...
got to be really careful with the loud pedal at those pressures...
in a tubeless tyre it will just spin the rubber on the rim when that happens with a tube say bye bye to your valve.
as a general rule I drop to 15 then 12 and after that its a risk assesment on going lower, IF its a dead straight shot out that should be manageable without too much noisy pedal if I get enough floatation I'll go lower...


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130's rule 


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