Upgrading 2018 Forest River Rockwood from 14" to 15" Tires

Updated 11/03/2025 | Published 01/08/2025

Question:

I am wanting to change from a 14 to 15 inch tire and wheel. i have a 2018 forest river rockwood geo prow g18fd. do you know if i need the 4.5 bolt pattern. thinking of the Kenda Karrier ST205/75R15 Radial Trailer Tire with 15 Black Mod Wheel - 5 on 4-1/2 - LR D - 15 Inch

asked by: William B

Expert Reply:

Hello William, thanks for reaching out. I can certainly assist you in upgrading your tires and wheels, but I do not have a way to know what bolt pattern your trailer currently uses. The 5 on 4-1/2" pattern is very common, so this is likely what you have, but the only way to confirm this is to measure. Measure from the center of one wheel stud to the outside edge of an adjacent stud and it should measure 4-1/2". If you come up with something different let me know.

As far as upgrading from 14" to 15" wheels and tires, the main thing to keep in mind is the clearance in the wheel well area. Our rule of thumb is that you want 3" between the tire and the fender, and at least 1" between the inside of the tire and the frame of the trailer. The ST205/75R15 tires are 27.3" in diameter and 8.1" wide. I suggest you compare these measurements to your trailer and make sure you will have adequate clearance with the larger tires. As long as you have space you will be good to upgrade and the # AM32424 tire/wheel combo will work great for you.

expert reply by: Jesse M

Jesse M.

11/3/2025

Hey William, did you get a chance to measure your bolt pattern and check the clearance for the 15-inch Kenda Karrier tires? It would be great to hear if the upgrade fit well on your Rockwood Geo Pro. Your update could make it easier for others planning the same change.