Can 175/80D13 Tires of C and D Load Ratings be Mixed on a Trailer

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Question:

I have a Tahoe tandem axle trailer with two Loadstar 175/80 D13 tires load range C AM35160 and would like to buy two new Loadstar 175/80 D13 tires load range D. Your technical specs show both tires have a section width of 6.6inch and an outer dia. of 24. Is there a problem with using the load range D with C. Same axle or same side or in front or behind. Is the tread width the same? My current class C have a tread width of 5. Is the class D the same? Is it a problem if it is not? Thanks for you time.

asked by: Larry R

0

Expert Reply:

The two 175/80D13 tires/wheels you referenced, Load Range C # AM3S160 and Load Range D # AM31985, will both have an overall diameter of approximately 24-inches, give or take a small fraction. The Load Range B and C tires/wheels will share a 6.6-inch section width while a D-range will have a section width of 7-inches.

We do not recommend mixing tire types, sizes or load ranges but for example in the case of a spare tire that will be used for only a short distance (and at or below its speed rating of 65-mph) it is not an absolute disaster to have differently-rated tires on the trailer for a brief period. I do not recommend having different tires in use on the trailer on an ongoing basis.

Different load ranges will have different psi pressure requirements and will deliver different weight capacities. They may also have noticeably different ride characteristics depending on their age, tread wear and ambient temperature conditions and on the trailer load. If you had to mix tires it would be better to have them be the same on any given axle and have the axle with the higher-rated tires be the one bearing the greater portion of the trailer load.

Tread width can vary very slightly between brands of the same size tire or between radial and bias types of the same size but these differences will be subtle since they all have to meet the overall width specification, in your case 175 mm.

expert reply by: Adam R

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Answer 1

The tire size ST175/80R13 is pretty standard, so we can definitely get you replacements for the tires. I suggest going with the Taskmaster Provider ST175/80R13 Radial Tire #TTWTRTM1758013C. These are rated up to 1,360 pounds at 50 psi and also has an…

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Answer 2

Yes, you can replace your load range C tires with load range D tires without issue. It will only become any issue when you go down load ranges, not up. The tires will have the same overall diameter as long as they are the same size regardless of…

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Answer 3

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 4

It sounds like you are running two different load ranges on your trailer. From my research most load range C tires have a maximum of 50 PSI and and a load range B tire will have a maximum of 35 PSI. The load range of a tire indicates it's…

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Answer 5

According to Blue Ox, it'll take an experienced installer about 4 to 5 hours to complete the installation of their #BX1128 Base Plate Kit on a 2016 Jeep Grand Cherokee. The install isn't what I'd call super-difficult, but the installation…

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Answer 6

The 5.30-12 tires, being wider, are going to make more contact with the road. This means that the noise, and heat build up will be higher than a 4.80-12 tire but the rolling resistance will actually be less because the tire is larger diameter. The…

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Answer 7

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 8

The two sizes you mentioned are pretty similar and fit many of the same 15 inch wheels. The 205/75-15 fits rim widths of 5 inch to 6 inch whereas the 225/75-15 fits widths that are 5 inch to 6-1/2 inch. The 205 is 27.1 inches tall and the 225 is 28.4…

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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

It sounds like you are speaking of the wires for the brake magnets. If this is correct, you will need to connect one of the wires to the brake controller output wire on your trailer connector and the other wire will need to be grounded to a clean…

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Answer 11

The #84 spindle is just a common way to identify the spindle dimensions typically used for 3,500 lb axles. So instead of listing out the parts, people can just say they have #84 spindles and it's easier to know what fits it. The CE Smith Trailer…

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Answer 12

Hey Clarence. There's no way to look at a tire or wheel and tell if it's a 5 on 4-1/2 or a 5 on 5 but you can take a real quick measurement to figure it out. If you'll look at the picture below you'll see a wheel with a red line on…

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Can 175/80D13 Tires of C and D Load Ratings be Mixed on a Trailer

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