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you have a way to air up? Main issue is the 20s on a small tire, not much side wall.

whats safe is more about how its driven off road. Your set up is for street performance. would be like a guy in a vet asking how low can they go down for off road.

I dont have bead locks and my starting air down is 8 psi. But i run 17x9" and on 35 once and 37 now. No issues in ten years. at 6 psi i have debeaded, not a big deal. Like ridding on pillows. You wont be able to get there.

I would try going down a step at a time see how much you can/need to. heck i run 25 street rear 27 front on a JKR.
 
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