What is the Metric Equivalent Tire Size in a Load Range D For the G78-15 Load Range C Tire

Question:

Have old G78-15 load C,want to replace with new metric size trailer tires in load D range, ?? My clearance between tire and inner well on the side of the tire is aprox. 1-1/2 now.What can I use ?? Also,would using a radial bluge and reduce side clearance?? Thanks

asked by: Joe

Expert Reply:

The Metric equivalent of the G78-15 load range C trailer tire is a 205/75-15 tire.

The 205/75-15 tire is not available in load range D, so you will have to stay with the load range C that you currently have. I would recommend going with a radial tire, for a better ride and increased performance and longevity. You should not experience any more bulge with a radial tire than you do with a bias ply tire so your should not have any clearance concerns as long as you stay within the capacity of the tires.

If you want a wheel and tire combination, and you have a 5 on 4-1/2 bolt pattern, I would go with the Karrier ST205/75R15 Radial Trailer Tire with 15 inch White Wheel, item # AM32395.

If you have a 6 on 5-1/2 wheel bolt pattern you would need to go with the Dexstar Steel Spoke Trailer Wheel, item # AM20532, that you mentioned, and the Karrier ST205/75R15 Radial Trailer Tire, item # AM10244. Normally, trailers with a 6 on 5-1/2 wheel bolt pattern have axles that require tires with higher capacities than the G78-15 or 205/75-15, but your 1-1/2 inch clearance would be a concern with a larger tire.

I am including links to FAQ pages on trailer tires and wheels.

expert reply by: Bob G