I have a 2019 Defender HD10 XMR and it comes with 30 inch ITP Cryptid tires. Factory settings are 14 lbs in the front and 26 lbs in the rear, however I too am wondering if the pressure should be changed to a lower value. Not so much in the front but the rear tires are 26 lbs. I guess it would depend on whether or not I am loading the box up or not. So far I have only put a couple of 20 L fuel containers and a chainsaw in the box so lowering the rear a bit might be a good idea.