The factory tire size is listed on the label on the drivers door jamb along with the recommended pressure.
The correct factory tire size for a 1999 Jeep Cherokee is 225/70R15.
The correct factory tire size for a 1998 Jeep Cherokee is 215/75 R15.
The correct factory tire size for a 1996 Jeep Cherokee is 215/75-15.
The correct factory tire size for a 2000 Jeep Cherokee is 215/75-15.
The correct factory tire size for a 2013 Jeep Cherokee is 265/50 R20.
The correct factory tire size for a 1997 Jeep Cherokee is 225/75-15.
The correct factory tire size for a 2002 Jeep Cherokee is 225/75-16.
The correct factory tire size for a 2014 Jeep Cherokee is 295/45 ZR 20.
The original tire size for a 1990 Jeep Cherokee Laredo is P195/75R15. The tires are for 15 inch wheels for the vehicle.
The correct factory tire size for a 2008 Jeep Wrangler is 255/75 R17.
P225 75R15 102S
maybe ask your closest mechanic