Well, I have a 2005 and I have 20's on mine, i would suggest no bigger than that. :)
replacing 2003 fore explorer sport front wheel bearings
( 16.8 gallons ) in the 2003 Ford Explorer Sport
A 2003 Ford Explorer Sport ( the two door version of the Ford Explorer ) has shock absorbers front and rear
The 2003 Ford Explorer has a 9 ft. 5.7 in. (113.7 in.) wheel base.
horn not working on 2003 ford explorer sport trac, just a clicking sound
The 2003 Ford Explorer has rear wheel drive.
Sport has better horsepower intern making it faster and easier to handle
According to the 2003 Ford Explorer Sport Trac Owner Guide : ( # 9007 bulb is used in the headlights )
The fuel tank size for the 2003 Ford Explorer Sport is ( 16.8 gallons / 63.6 liters ) according to the owners manual
According to the 2003 Ford Explorer Sport Owner Guide : ( 16.8 US. gallons ) is the tank capacity
If it's like my 1995 Ford Explorer , the tilt lever unscrews
location of alternator