If they are the same as on a 2001 Sport Trac, they are P25570R16...Hope this helps
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Listed on the drivers door post and in your owners manual.
Open the drivers door and on the end of the door or the pillar there should be an information sticker that shows the original size tires
YES, both tires must be the same size on the same axle, be it posi-trac or non posi-trac. Never, ever, mix sizes on any axle.
On a 2003 Ford Explorer Sport : Open the drivers door and on the latch pillar you will see an information sticker . One of the things the sticker shows is the original size of tires on the vehicle from the factory
According to the 2005 Ford Explorer Sport Trac Owner Guide : ( 22.5 U.S. gallons / 85.2 litres )
According to my 2001 Sport Trac Manual Fuses 4,5,23 @ 32 are not used for anything.
The 2005 Ford Explorer Sport Trac came from the factory with the Motorcraft BXT-65-650 battery ( that's BCI group size 65 , 650 cold cranking amps )
Tires Size - 215/60/R15" Rim Size - 15 inches
According to the 2007 Ford Explorer Sport Trac Owner Guide : The fuel tank holds ( 22.5 U.S. gallons / 85.2 liters )
The 2002 Ford Explorer Sport Trac owners manual shows : Motorcraft BXT - 65 - 650 ( Ford's " top of the line " battery for your vehicle )
The 2003 Pontiac Sunfire came from the manufacturer equipped with 225 65R 15 tires. The back and the front tires were the same size.