What’s The Difference Between ST205 75D14 And ST205 75R14?


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.

What does St mean on a tire?

ST stands for Special Trailer. These tire sizes are meant for trailers, including fifth wheels and other travel trailers, as well as boat and utility trailers. If there’s no letter before the first number, you have a metric tire most commonly referred to as European size.

Do trailer tires need to be balanced?

Since the primary duty of a trailer tire is supporting a vertical load, rather than gripping an automobile through turns, trailer tires do not have to be dynamically balanced like passenger car tires do. Steering and cornering are less of a concern on a trailer tire than they are on an automotive tire.

What size tire is 75R14?

205/75R14 tires have a diameter of 26.1″, a section width of 8.1″, and a wheel diameter of 14″. The circumference is 82.0″ and they have 773 revolutions per mile. Generally they are approved to be mounted on 5-7″ wide wheels.

What does R and D stand for on tires?

R indicates the construction used within the tires casing. R stands for radial construction. B means belted bias and D stands for diagonal bias construction. 16 The last dimension listed in the size is the diameter of the wheel rim, which is most often measured in inches.

What’s the difference between load range D and E?

Load range D has a capacity of 1,220 lbs at 65 psi, whereas load range E has a capacity of 1,520 lbs at 80 psi. Basically the only difference between the two is the weight capacity.

Why do trailer tires wear out so fast?

That said, rapid or significantly uneven trailer tire wear can be caused by: Riding with the wrong tire pressure. Exceeding your tires’ load capacity. Trailer misalignment or bent wheels from hitting curbs, potholes or debris.

Are Light Truck tires better than trailer tires?

The truck tires have a higher top speed, typically to 100 (speed rating Q) or 106 (R). You may or may not want to haul a trailer at 75 mph, but the higher top-speed rating usually means a tire better resists heat buildup. Remember, heat is a tire’s enemy.

Can I use a passenger tire on my trailer?

Don’t. Trailer tires and passenger car tires have different structures to respond to different stresses. Using a trailer tire on your car, or a car tire on your trailer, could lead to disastrous consequences. Passenger vehicles interact with the road through their tires.

How many years do trailer tires last?

Each tire manufacturer will likely have different recommendations on the service life of a particular type of tire, but statistics suggest the average life of a trailer tire is about five years under normal use and maintenance conditions, and that tire replacement should be considered after three years, even if the

What should my trailer tire pressure be?

What psi Should Trailer Tires be Inflated To Trailer tires should always be inflated to the maximum air pressure indicated on the tire. The tire on tire and wheel combo #AM30620 for example should be at 90 psi.

Can I use car rims on a trailer?

If your vehicle wheel/rims fit your trailer hub bolt pattern and have clearance from the frame, body, or fender of your trailer, you can use passenger wheel/rims.

What does 75R14 mean on a tire?

The second number, 75, refers to the tire’s sidewall aspect ratio (also called section height) and means in your case that the aspect ratio of your tire is 75% of the tire’s width. The R letter indicates the tire has radial construction. And finally the 14 indicates the diameter of wheel the tire will fit.

What does the R14 mean on a tire?

R14 means the tire is meant to fit on a 14-in. diameter wheel. The R means it’s a radial construction tire, which refers to the direction of the tire’s internal structural cords. These days, radial tires are the industry standard for passenger vehicles. The 82H is the tire’s maximal load and speed rating.

How tall is a st205 75R14?

6.05 in

Unit: Imperial Imperial Metric
Rim Width Range 5.00 in – 7.00 in
Overall Diameter 26.11 in
Sidewall Height 6.05 in
Radius 13.05 in

Can I mix R and D tires?

Expert Reply: It’s fine to use a radial-type tire as a spare (a tire with “r” in its size code) with a trailer that has Bias ply “d” tires but for a short distance in the event of a flat tire. But mixing tires is not recommended for everyday use because their internal construction is different.

What is the difference between ST205 75D15 and ST205 75R15?

The difference between the two tire sizes you mentioned is the construction of the tires. The R in the ST205/75R15 indicates that the tire is a radial. The D in the ST205/75D15 indicates that it is a bias-ply.

What is Load Range D on a trailer tire?

The D load range is rated for 2,540 pounds at 65 psi. And the E load range is rated for 2,830 pounds at 80 psi. If you had a single axle trailer with a gross weight rating of 5,000 pounds, you would use the D or E tires in this size since the C tires would be under rated for the weight.

Are 10 ply tires better for towing?

To be completely safe when towing with your truck, you will need 10 Ply or Load Range E tires. The best 10 Ply tires for towing should be capable of at least 3,000 lbs of weight per tire and do it while giving you safe driving experience with a high amount of grip and traction.

Which is better Load Range C or D?

Expert Reply: 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.

What load range is a 12 ply tire?

Tire Ply-Ratings

So typically we would say a tire is 6-ply rated, 8-ply rated, or 10-ply rated, and those correspond to Load Range C, D, and E respectively. So of course a Load Range F does correspond to a 12-ply rating.

Should I fill trailer tires to max psi?

When it comes to trailer tires you always want to have them inflated to their max psi when cold. Not only do you get the full capacity at the max psi, you also will generate less heat in the tire since there won’t be as much flex in the sidewall, you’ll get better wear and better fuel mileage.

Do you rotate trailer tires?

Trailers, just like vehicles, need their tires rotated too. To avoid mechanical problems both minor and major, it is recommended that you rotate your trailer tires.

How often should trailer bearings be replaced?

Many trailer manufacturers recommend this maintenance every year if your trailer gets normal use, or at least every 20,000 miles.

Why can’t you use trailer tires on a car?

Putting a trailer tire on your vehicle or a car tire on your trailer might result in disaster. Passenger vehicles use their tires to interact with the road. Through accelerating and braking, the tires transfer power back and forth.

What is the tongue on a trailer?

Essentially, the trailer tongue is the bit that keeps your trailer balanced and its weight forward on the tow hitch, which is responsible for giving you a safer tow when hooked up to a moving vehicle — and it also strengthens the chassis and helps keep the trailer stable while in use.

What does ST and LT mean on tires?

asked by: Jerry. Expert Reply: Yes, both special trailer (ST) and light truck (LT) tires can be used on a 5th wheel trailer. They are actually the only two types of tires rated for this use. The reason for this is that tires on a trailer will be subjected to much harsher conditions that require a stiffer sidewall.

What does the P stand for on tires?

P identifies your tire as a Passenger Tire. The P stands for PMetric. If your tire size starts with LT rather than a P than it identifies the tire as a Light Truck tire. 225 identifies the tire section width, which is the measurement of the tire from sidewall to sidewall in millimeters.

What’s the difference between LT and P tires?

The cords in a LT tire are a larger gauge than P-metric tires so the tire can carry heavier loads. Very often LT tires will have an extra steel belt, a deeper tread and thicker rubber in the sidewall for more protection vs a p-metric tire. LT tires are usually 8-ply (Load Range D) or 10-ply (Load Range E).

Are trailer tires speed rated?

Trailer tires commonly have tire speed ratings in the 65 – 75 mph range. Unless otherwise noted, the speed rating for trailer tires is 65 mph.

How can I make my trailer tires last longer? (video)

https://www.youtube.com/watch?v=0vSUxMxakw8

How can you tell the age of a trailer tire?

How do I determine the age of my trailer tires? Every tire has a date code stamped on the sidewall, which is the date the tire was manufactured. The date code is usually at the end of the DOT I.D. and is a 4 digit number. The first two numbers indicate the week (out of 52) and the last two digits indicate the year.

What is load range B on a trailer tire?

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 size but it will not increase the capacity of the trailer.

How do you grease trailer bearings? (video)

https://www.youtube.com/watch?v=O6ndN_9NQL4

Should I increase tire pressure for a heavy load?

An increased pressure reading (typically 2 to 6 psi higher) is normal when tires are hot. If recommended by the vehicle manufacturer, increase tire pressures for towing, carrying heavy loads, or extended highway travel.

How hot can trailer tires get?

Tire temperature

Most Tpms will list 158 as a critical temperature to not exceed. The critical temperature for the tread is over 200 (around 220).

What is the most common trailer tire size?

8 – 9 – 10 – 12 – Inch Trailer Tire Sizing

Older Size Tire Size Overall Diameter
16.5 x 6.5 – 8 165/65-8 16.5 inches
18.5 x 8.5 – 8 215/60-8 18.3 inches
6.90/6.00-9 21.1 inches
205/50-10 18.3 inches

Are all 5 bolt trailer rims the same?

While a 5-Bolt on 4.5″ is standard and by far the most common among trailer wheel 5-bolt patterns, there are times in which the trailer manufacturer uses a different pattern such as 5 on 5″.

Can you put radial tires on trailer?

Yes, you can use radial tires on a trailer as long as they are trailer tires. Trailer tires will have ST in front of the size. Radial indicates which way the belts run in the tire.

How do you read trailer tire sizes?

Sizes 12 inch and smaller are generally listed by a two number size, such as 4.80-8 or 5.70-12. The first number in this size is the width of the tread, the second number is the size of the rim that it mounts on. Large size trailer tires are made up of three numbers.

What does the 75 stand for on a tire?

75—This is the tire’s aspect ratio, comparing the tire’s height to its width. For this tire, it means its height is 75 percent of its width. R—This defines the construction within the tire. “R” stands for radial. “B” means belted bias and “D” stands for diagonal bias construction.

What is the difference between 82t and 82h?

So, what does the T or H mean on tires? The “T” or “H” on tires pertain to their speed ratings. A T-rated tire can withstand top speeds of up to 118 mph (190 km/h), while an H-rated tire can support up to 130 mph (210 km/h). It is important to note these markings and stay within those speed limits.

What is the widest 14 tire?

Tire Sizes by Wheel Diameter

14″ Options
115/70-14 185-14 225/50-14
135-14 185/55-14 225/60-14
135/80-14 185/60-14 225/70-14
165-14 185/65-14 235/60-14

Can I replace 15 inch wheels with 14 inch?

To go from a 15 inch trailer wheel to a 14 inch trailer wheel would only require you to match up the bolt pattern of what you currently have with what you would like to install. You will first need to determine what bolt pattern you have on your wheel.


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