Difference Between Trailer Tires ST205/75D14 and ST205/75R14

Question

Question:

What is the deference between a st205/75D14 and a st205/75R14

asked by: Walt

0

Expert Reply:

Tire designations ST205/75D14 and ST205/75R14 are both for special trailer tires with a 205mm width, 75-percent aspect ratio and that fit a 14-inch wheel. The difference between them is the tire's type of construction.

The ST205/75D14 tire is a bias ply type with a Load Range D rating. This size/grade tire has a weight capacity of 2,100-lbs at 65 psi. Lower capacity C- and B-rated tires in this size offer weight ratings of 1,760-lbs at 50 psi and 1,430-lbs at 35 psi, respectively. For example, # AM1ST86 is a Load Range C bias ply tire.

The ST205/75R14 tire is radial type that will typically run cooler than a bias ply and this means it will be likely to last longer. Also a radial tire flexes more than a bias ply tire, giving it better ground contact, traction, stability, and tread wear.

I have linked you to a series of articles on trailer tires and wheels that may be of interest to you. We offer tires and wheels alone, and also pre-mounted tire/wheel combinations, that can be seen on the link provided for you.

expert reply by: Adam R

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Capt B.

11/11/2021

I have had no good luck with Kenda or Good year trailer tires. Constant blow outs at highway speeds on my tandem axle boat trailer, Tire with less than 400 mile & less than 6 months old. I am considering a light truck tire instead of a trailer tire

Reply

Les D.

11/15/2021

If you are having constant tire failures on your trailer, it will have nothing to do with the tire brand. I recommend that you use Special Trailer (ST) tires for a trailer and Light Truck (LT) tires for a light truck. ST tires are designed for trailer needs with stiffer sidewalls. Causes of trailer tire failures include, 1. Tires that become over heated from not having the recommended air pressure, 2. Also over heated from having a tire air leak, 3. Tires that become overheated from being overloaded with weight, 4. Tires that have cracked or damage rubber from age or bad roads, 5. Tires that are damaged from badly installed components like crooked/bent axles that cause excessive wear very quickly. I recommend examining your blown tires to determine the cause of the blowouts.

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Capt B.

11/15/2021

@LesD FYI: I have had 4 blowouts this year with Kenda ST205/75 R 14 C & D rated. The tires have had between 350 to 850 miles on them & with a mfg. date of late 2020 or 2021. No idea why they are blowing out. Even the company doesn't know why. Ironically I have 15 year old Kenda tires that are still mounted on the original rims holding air, although they are well tread worn. ???????????????? Capt. Bill Bennett

Reply

Capt B.

11/15/2021

@LesD Follow up QuestionsADD COMMENT I have had no good luck with Kenda or Good year trailer tires. Constant blow outs at highway speeds on my tandem axle boat trailer, Tire with less than 400 mile & less than 6 months old. I am considering a light truck tire instead of a trailer tire Is there a higher rated tire than D for 14" rim? Capt. Bill

Reply

Ronald

4/14/2024

Thankyou, My trailer will just sit in the parking lot. I do not take it on the road except to service the boat a couple of miles away. Will the ST205/75D14 be ok?

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Answer 1

Long story short, yes you can. But going with the ST205/75R14 would be a better replacement than a ST205/75D14 because the R in the first size means it is a radial tire whereas the D in the second size means it is a bias ply. The main difference…

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Answer 2

Hey Dave, I wasn't able to find any wheels listed at $163, but I was able to find the Karrier ST205/75R14 Radial Trailer Tire with 14" White Wheel #AM32153 and the Loadstar ST205/75D14 Bias Trailer Tire with 14" Black Wheel #AM3S451…

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Answer 3

Hello Sam, thanks for reaching out. The Replacement Track Nut #853-2106 is designed to work with the Thule Tracker rails, as well as most OEM roof rails. I am not sure exactly what Thule rails you have but I can provide dimension of the track nut for…

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Answer 4

You should have a standard 1/4" grease zerk fitting on your EZ Lube spindles. The 1/4" zerk is a fairly common size so you should be able to easily acquire one. We actually have the Powerbuilt Pistol Grip Grease Gun #ALL940798 which would…

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Answer 5

Yes, you can switch from a 14-inch tire and wheel combo to a 15-inch tire and wheel combo, so long as your new wheel has the same bolt pattern, and you have the space to fit the larger wheel and tire. For example, if you had the Provider ST205/75R14…

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Answer 6

Hello Ronnie, Yes, you can likely upgrade from ST205/75R14 to ST225/75R15 tires and wheels, especially since you mentioned your trailer has wider axles and plenty of clearance. The ST205/75R14 tire is about 26.1 inches tall and 8.1 inches wide, while…

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Answer 7

So you have 14 inch rim that has a 5 on 4-1/2 inch bolt pattern and are looking to go to a 15 inch rim. For that you would want the part #AM32424 as it has a ST205/75R15 tire mounted to it which has a 1,820 lbs at 50 psi capacity. The dimensions of…

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Answer 8

The Replacement Track Nut #853-2106 is sold individually.

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Answer 9

Here are the 2 different mounting options for installing the Batwing and Foxwing Awning Relocation Kit #RR31102. You can change the orientation of the brackets so that the awning will either hang higher or lower depending on your application.

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Answer 10

Your easiest and best solution would be to go with a new tire in the size of 205/75-14 which fits your 14 inch diameter wheel that is 5.5 inches wide (that's what that number means). This will only take up .2 of an inch more of your available…

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Answer 11

To pick out a replacement axle for you trailer you will need to take a couple measurements. You want to get one that matches your current axle so that you will know that it is compatible. You need to measure the distance between the spring seats on…

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Answer 12

Even when stored in the somewhat controlled environment of a garage, tires are still subject to dry rot and flat spotting. Even if the tire tread has plenty of depth left and you can't see any cracking with the naked eye, the generally accepted…

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