Can a Bias Ply Trailer Tire be Used in Place of a Radial Trailer Tire

Question

Question:

on my trailer rv i had st205/75r14 tires the tire place repace them with a cheeper tire st205/75D14 tire is this going to be ok and safe

asked by: David N

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Expert Reply:

The R in the original tire size indicates a radial tire. The D in the new tire size indicates it is a bias ply tire. Radial tires usually cost more than bias ply tires but you can use either one provided that it is the right size, which in this case it is, and the capacity is enough for the gross trailer weight. So yest, it is safe.

Radial tires do track better and run cooler than bias ply tires. But bias ply tires are better for rough terrain. You just want to make sure that all of the tires are the same construction type, either all radials or all bias ply. I have included a link to our help article on trailer tires for you to view.

expert reply by: Michael H

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Answer 1

We have an aluminum 7 spoke 14 inch trailer wheel that looks pretty close to the wheel in the picture you sent us, but it's not an exact match. For that wheel you would want the part #AM22329. For a 205/75R14 you can use #AM10234 or tire…

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Answer 2

Based on the picture you sent me it looks like everything would be fine, although the fender clearance is pretty tight. But the sizes you list don't quite add up. It sounds like you have a 14.5 inch wheel that you installed a tire designed…

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Answer 3

The Loadstar ST215/75D14 Bias Trailer Tire with 14" Aluminum Wheel part #AM3S582 is the correct spare wheel/tire for your boat trailer. In order to mount this on the trailer, you can use the Fulton Hi-Mount Spare Tire Carrier part…

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Answer 4

In order to determine the torque rating for the lug nuts on your trailer you will need to know check out the chart I attached that shows all of the torque specs for all the trailer lugs available based on stud size, wheel material and wheel size.

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Answer 5

The difference between an load range C and load range D tire in the same size is the capacity and psi rating. The two tires will still have the same dimensions and fit on the same wheel. The D rated tire has a higher capacity. For a ST175/80D13 like…

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Answer 6

Load range B trailer tires are going to have a lower capacity than C load range tires. Basically that, psi rating, and the ply rating are the only differences. A higher load range tire would last a little longer than lower load ranges of the same…

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Answer 7

Your math is correct in your trailer weight load example. If a fully-loaded tandem axle trailer weighs 4000-lbs then each of the 4 tires will bear 1/4th of that load, or 1000-lbs. In this case a tire rated for 1300-lbs would provide a good safety…

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Answer 8

The three most common lug stud sizes for a trailer are 1/2"-20, 9/16"-18, and 5/8"-18. In order to make sure you get the correct lug nuts you need to measure the lug studs on the trailer now as we have no way to look this up for…

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Answer 9

Even though I cannot comment specifically on the grease you used because I am not familiar with it, I can tell you the best grease for trailer bearings is a a grease with a rating of GC-LB, which just means it is made to withstand very high…

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Answer 10

You can add larger wheels and tires to a trailer as long as you have enough room for the larger size. The main clearance issues we find when putting larger tires and wheels on a trailer is from the top of the tire to the fender and from the inside…

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Answer 11

To determine the size of the hub assembly you need to purchase you have to determine which bearings are in the old assembly. If the old assembly has L44649 inner bearings, you would use the hub you chose #8-258-5UC1. If the inner bearings are marked…

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Answer 12

To find the load capacity for your axle you should look on the trailer VIN plate or sticker that lists the VIN number. The weight rating of the axle should be listed on that same plate or sticker. Also, the axle could have a tag or plate on it that…

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