Rim and Tire Recommendation for Use on a 1989 Easyloader Trailer  

Question:

Expert Reply:

From a clearance point of view, the Loadstar ST175/80D13 Bias Trailer Tire with 13 inch Galvanized Wheel, part # AM3S160, should work fine since you have plenty of clearance.

The rim that is on the # AM3S160 has a 5 on 4-1/2 inch bolt pattern, you will want to confirm that that is the bolt pattern hub you have on your 1989 Easyloader Trailer. Check out the link below to see how to determine what bolt pattern hubs you have. There is also a link below on how to measure a trailer tire that you might find informative.

I would also recommend that since the size is different from your current tire size you have that you replace both the driver and passenger wheels with a # AM3S160.

The # AM3S160 has the size 175/80, which translates to 140 mm section height which = 5.56 inches x 2 = 11.03 + 13 inch rim size =24.03 inches total height.

While your current tire has the size 175/70 which equals 122.5mm which equals 4.8 inches x 2=9.7 +13 = 22.7 inches total wheel height.

That means that your current tire is 1.3 inches smaller in diameter than the # AM3S160.

The weight capacity of this wheel is 1,360 lbs at 50 psi, you should check your axle capacities on your trailer to make sure this wheel and tire combo would be sufficient.

Also, this tire has an ST application type and is designed to be used on boat or utility trailers at its maximum psi, which is a better tire to use on your trailer than one designed for a passenger vehicle as it has a thicker sidewall.

The wheel of this setup is intended for use on trailers, and because of this it has an offset of 0. If the current wheel combination on your trailer is using a vehicle rim you will first want to see if it has an offset on the wheel, and then determine if using a wheel with a 0 offset will work on your trailer setup.

This is done by laying the wheel face down so the back is facing up towards you. Lay a ruler across the inboard flange. Take the measuring tape and measure the distance from the rule to the hub mounting pad in inches. Your result is the wheel backspace.

Measure the width of the rim. Next, calculate the center line of the wheel. This is accomplished by taking the width of rim and dividing the number by two. Subtract the center line from the backspace to find the offset.

Use your answer to determine of the offset is positive, negative or zero. If your center line is greater than your backspace you will have a negative offset. If the center line is less than your backspace you will have a positive offset.

expert reply by: Jameson C

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