Replacement Tire for a 18.5-8.5-8 Tire

Question:

I need a replacement 18.5-8.5-8

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Expert Reply:

Based on the tire info sticker that you attached it looks like you are looking for a replacement tire for your 18.5-8.5-8 tire size.

The 18.5-8.5-8 tire has an overall diameter of 18.5 inches, an overall width of 8.5 inches and fits an 8 inch diameter wheel. The closest size tire I would have is the 215/60-8 bias tire. It will have an overall diameter of 18.1 inches and an overall width of 8.9 inches. You will want to check to make sure you will have the clearance for the extra width.

For just a tire you would want the part # AM1HP28.

In the 215/60-8 tire and wheel I have the Kenda 215/60-8 Bias Trailer Tire with White Wheel - 5 on 4-1/2 - Load Range D, part # AM3H323. This is an 8 inch white wheel with a 215/60-8 tire with a load range D. The load range D tire has a maximum load capacity of 1,165 lbs at 70 psi.

I also have the Kenda 215/60-8 Bias Trailer Tire with Galvanized Wheel - 5 on 4-1/2 - Load Range D, part # AM3H325. This is the same tire as above on a galvanized wheel.

When changing tire and wheel size on a trailer you will want to make sure that all of the tires and wheels are replaced with the same size. You will not want to mix two different size of tires. Also, to prevent heat buildup you should run trailer tires at the max PSI rating stated on the tire sidewall. The thicker sidewalls of trailer tires are susceptible to heat build up if ran at lower pressures and this will decrease the service life of the tire.

The other thing to remember is that if you are installing a tire with a higher load capacity, it does not mean you are increasing what the trailer can carry, because the weight capacity is determined by the lowest rated item in the complete axle assembly.

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Jameson C

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