I use the Smittybilts 5.4 cfm 12v pump, it airs up my 33's from 8 psi to my 25 psi street pressure, all four, in about 15 minutes including set-up. I was going to set up an onboard air before I won this in a raffle. Now that I've used this I'd buy one of these in a heartbeat. Some of the guys in my club have used it on their 35's and were amazed at the fill rate. I'm happy.
