The correct factory tire size for a 1987 Jeep Wrangler is 215/75R15.
P215/65r15
p185-75-14 are the size
its on the vin plate on your door
185/70-R14
Yes, tire stores do offer tire size guides for take home use. For instance, most stores offer the Michelin tire guide that you can take home and peruse to help find the best tire size and fit for your vehicle.
That takes 235 75 r 15
235/75/15
You have to look at the tire size and it will tell you!!! On the size of the tire it will look something similar to this P215/70R15 97S Keep in mind this is not the size to use just an example depending on your rim size and other sizes will determin the size of the tire just use that number that is on the tire and take it to the tire place of your choice and they will help you get the correct tire!
Many medium size modern cars take that size.
22x11x9
225/50/16 i think