If your Ford has 14" wheels then either of these sizes will be correct. 185/70-14 195/65-14 If it has 15" wheels then install: 205/60-15 This should be listed on the driver's door post.
According to the 1998 Ford Contour SVT supplement : The original tires were the ( Goodyear Eagle F1-GS , size P205 / 55 ZR-16 ) on 16 X 6.5 inch wheels
20560r15
tire size for 1998 2dr ford ranger is?
205/65/15
235/70/16
P235/75/R15
185/65/14
On a 1998 Ford Ranger : Open the drivers door and on the latch pillar you will see an information sticker One of the things it shows is the original size of tire on the vehicle from the factory
185/65/15
Open the drivers door and look for an information sticker , it should show the tire size that originally came on the vehicle
Open the drivers door , and on the end of the door will be an information sticker that shows the original size tire on the vehicle from the factory
Open the drivers door and on the latch pillar will be an information sticker that shows the size of tire on the vehicle from the factory