What Tire Size Replaces B78-13 ST Tires

Question

Question:

Will a p175/70r13 replace my old b7813st?

asked by: Donnie

1

Helpful Expert Reply:

Your B78-13 sized trailer tire has a metric size of 175/80-13. However, a P175/70R13 is a passenger vehicle tire and I do not recommend that it be used on a trailer. Trailer tires have special designs with stronger side walls so that they handle vertical loads from trailers.

I recommend the Kenda Karrier ST175/80R13 Radial Trailer Tire - Load Range D Item # AM10210. It is a radial special trailer tire that provides excellent traction in wet and dry conditions. It fits 13 inch wheels and has a maximum load capacity of 1,610 lbs at 65 psi. The Kenda Karrier Item # AM10210 provides a smooth ride, runs cooler than a bias ply tire, and is excellent on highways.

Links to more information attached.

expert reply by: Brint H

1

Answer 1

A trailer tire size 175/80-13 will replace either an A78-13 or B78-13 trailer tire. A 175/80-13 is going to have 3 load ratings: B at 1,100 pounds at 35 psi, C at 1,360 pounds at 50 psi, and D at 1,610 pounds at 65 psi. This size will have a…

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Answer 2

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 3

The B78-13 ST tire size translates to a ST175/80-13 size tire. For a replacement I would highly recommend the part #TTWTRTM1758013C. This is a radial tire which will perform better than a bias ply and because it has a higher speed rating of 81 mph…

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Answer 4

The difference between the letter D in your ST175/80D13 and the R in the tire size of the Wheel and Tire ST175/80R13 part #AM31985 that you referenced is the tire construction. D stands for bias-ply which is a less preferred tire construction,…

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Answer 5

When switching from 12 inch wheels to 15 inch wheels you will want to make sure that you have the clearance needed for new tires and wheels. Going from 12 inch wheels to 15 inch wheels will raise the trailer substantially. The 12 inch tires we sell…

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Answer 6

The correct replacement size for a B78-13ST is a 175/80-13. For this, I recommend the Provider ST175/80R13 Radial Trailer Tire part #TTWTRTM1758013C which is an excellent radial ply option that will run cooler. It also has an 81 mph and two-year…

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Answer 7

I spoke with an engineer from our hub manufacturer, Dexter, and they do not recommend using a hub for 8-12 inch wheels with a 13 inch wheel. However, they said that they do not make a hub for 13 inch wheels that has a hub flange diameter of smaller…

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Answer 8

The issue with using a 13 inch wheel on the Dexter Trailer Hub and Drum Assembly for 2,000-lb E-Z Lube Axles #8-257-5UC3-EZ, which you correctly noted is for 8 inch to 12 inch wheels, is that hubs of that size do not have a large enough flange…

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Answer 9

The correct torque for installing lug nuts on your 5 X 8 trailer's 5-lug wheels will depend on the size of the lugs. For a 1/2-inch lug the torque spec ranges from 75- to 85-ft-lbs. For a 9/16-inch lug the torque spec ranges from 135- to…

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Answer 10

With you having 2- 3500lb axles your maximum capacity is 7000lbs evenly distributed over both axles. With the trailer weight of 8240lbs you definitely risk damaging the axles, suspension and other parts of the trailer. Trailer Axles will sometimes…

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Answer 11

You will need the Red LED Trailer Clearance or Side Marker Light #328-K-52 or Amber LED Trailer Clearance or Side Marker Light #328-K-51 for your 2018 Forest River Sunseeker motorhome. These lenses have the same Top Command SAE-AP2-16 markings on the…

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Answer 12

If your current springs have 5 leaves then going to a 7 leaf spring will increase the height of the trailer a little and make the trailer more susceptible to sway. Regarding capacity if you go with springs rated higher than what is required it will…

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What Tire Size Replaces B78-13 ST Tires

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