New Mexico Spare Tire Cover for Jeep RV and more Each cover is sustom made to fit your tire size We can make any size tire cover After your purchase Please e-mail us with your Tire size since each cover is custom made to fit your spare tire we need your whole tire size. Your tire size can be found on the side wall of the tire and should look something like this example: 225/75/15. Please be sure to check the size on the spare tire, because sometimes the size on the spare tire is different then the size of the tires mounted on the vehicle. Please note the the numbers 15, 16 ,17... refer to rim size only. I need your complete tire size found on the side wall of the tire. In some cases your tire size might look like 30x10.5/15 or 7.00-15. These sizes are more commonly found on trailers and jeeps with larger tires.