My Jeep Wrangler Has A Tire Size Of 30 X 9.5 R15 LT, Yet When I Shop For Tires They All Say P215/75R15. Are These Comparable Tires, And What Does The 30 X 9.5 R15 LT Mean? Is There Other Comparable Sizes, Or Do I Have To Use A P215/75R15?

With this kind of issue you are best contacting Jeep as they will be in the best position to advise on what tires are best for your Jeep Wrangler.

If you are based in the United States you can contact Jeep via the phone at 1-877-426-5337. The phone line is open between 08:00 and 20:00 Monday to Friday and between 09:00 and 17:00 Saturday and Sunday.  You can also contact Jeep via the post at Chrysler Group Customer Care, P.O. Box 21-8004, Auburn Hills, MI 48321-8004.

If you are based in Canada you can contact Jeep via the phone at 1-800-465-2001. The phone line is open between 08.30 and 17:00 Monday to Friday. You can also contact them by post at Chrysler Canada, Inc, Customer Assistance Centre, P.O.Box 1621,Windsor, Ontario N9A 4H6.

If you are based in the UK you can contact Jeep via the phone at 01753 519 874. The phone line is open between 09:00 and 18:00 Monday to Friday. You can also contact them by post at Fiat Group Automobiles UK Ltd, 240 Bath Road, Slough, Berkshire, SL1 4DX.

If you are based in Mexico you can contact Jeep via the phone at 01-800-505-1300. The phone line is open between 08:00 and 18:00 Monday to Friday. You can also contact them by post at Prol. Paseo de la Reforma #1240, Col. Sante Fe C.P.04589, Cuajimalpa, Mexico, D.F.

Be sure to have your vehicle identification number (VIN) and current mileage on the odometer ready or include with your correspondence if posting your question.

30 means the diameter in inches x 9.5 inches wide R(radial) 15 inch diameter wheel LT (light truck)
a p215/75 R15 is a p(passenger) 215 millimeters wide or 215 divided by 25.4 is 8.46 inches wide, 75 is the % aspect ratio therefore the height of the tire is 75% tall as it is wide or 6.35 inches high R(radial) 15 inch wheel.
So: The height of a p215/15 R15 is 15+ 6.35 +6.35 = 27.7 inches overall height or diameter compared to the 30 inch diameter

30 is the total diameter in inches, 9.5 is the width of the tire; 9 1/2", 15 is the wheel size, and LT is for Light Truck.

You can't mix tire sizes on a 4WD, and there's plenty of 30X9.50X15 tires around.
I went with a set of 5 BF Goodrich Mud Terrain tires for my 1999 Wrangler, and they're great off road, and are actually pretty quiet on the road, even though they look so aggressive.

215 is the width in millimeters, 75 is the sidewall, and it's 75 % of the width 215mm, 161.25mm. Divide by 25.4 and multiply by 2, and you get 12.79" + 15" = 27.79" which is over 2" smaller diameter, over 1" lower, and the width is 8.5", 1" narrower, than 30X9.5X15.

Peter thescirocco DOT com