Oh and btw in case you didn't know the first number is the tire width in millimeters. To convert to inches you can divide that by 25.4 (10 millimeters in a centimeter, 2.54 centimeters in an inch).
In this case 285/25.4 gives us a width of 11.22", so with a 7" rim the tire would only be 4.22" wider than the rim.
Also, if a tire is wearing more in the middle than at the edges that can be a sign of over-inflation. Check with the place you get the tires on possibly running a lower pressure to achieve more even wear (but don't go too low on the pressure...that can be unsafe and also decrease MPGs).
98 Ranger XL 2wd 2.5L 5spd 3.45 gears
15x7 Pacer black steel wheels, 225/70r15 Cooper Discoverer ATR tires, LED front side marker lights & license plate lights, red LED dome light
GoLight #5149-M (work/off road use only).
Suspension lift, 31 or 32" tires, 4.something gears