How fast can you run with aired down tires?
 

I'm running a 12 JKU Rubicon with 285/75-17 KM2's (34in) on stock Moab wheels. I've got some long stretches of desert driving to do with mostly pretty good surface where 30-40mph is ok but with lots of intermittent rough stuff at a crawl. I'd like to air down to soften the ride a bit. If I go down to ~20 psi, will 30-40mph be hard on the tires? I would trial and error this to be safe but I don't want to overheat and ruin any tires.

Whether or not it's the "right" thing to do or how many others would disagree, I wheel about 10 miles away each weekend. I run 8psi in 37" mud grapplers which are load rated at E. I've never aired up before I left and run the speed limit home, the max of which is 65 mph. I've never had a problem. Take that for what you will.

20 psi isn't really aired down. At 20 I wouldn't even worry about what speed your doing

I've gone 70 mph for miles aired down to 11 psi in my mtrks countless times. Probably not smart but i have to get to air somehow.

No problem running 12 psi after offroading. Just be careful around the turns lol

Aired down
 

Tires are to damn expensive, I'm airing back up ;)