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Posted: 8/9/2014 5:44:22 AM EDT

Moved up from stock tires to a 305/70R18 (35") on my 2010 F150 SuperCrew. What pressure should I be running?

Link Posted: 8/9/2014 5:48:54 AM EDT
Exactly what it says on the door jam.
Link Posted: 8/9/2014 5:54:51 AM EDT
Door jam pressure is for factory size tires, for the best ride, not the best tire wear. Tires will list max pressure on the sidewalls. I usually run front tires 5lbs under max pressure, that way they wear the best, rears depends on the load, but if running unloaded I usually run a few pounds over door jam amount. Then they don't wear in the middle.
Link Posted: 8/9/2014 6:04:15 AM EDT
Your stock pressures are now totally irrelivent


I'd do a "chalk test" and run whatever pressure crowns the tire slightly on such a heavy rig
Link Posted: 8/9/2014 6:21:40 AM EDT
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Krochus:
Your stock pressures are now totally irrelivent


I'd do a "chalk test" and run whatever pressure crowns the tire slightly on such a heavy rig
View Quote



Yeah, knew that stock #'s are no longer relevant, and am thinking I need to run at least 40 psi, but not sure.
Link Posted: 8/9/2014 6:22:48 AM EDT
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By ske714:
Exactly what it says on the door jam.
View Quote



That's with the stock tires. 35" (12.5" wide) is a lot bigger tire... Changes the game a bit.
Link Posted: 8/9/2014 4:27:14 PM EDT
Chalk test.
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