Trailer Tire Sizing
- *ST - These tires are for a trailer (Specialty Tire for trailer use only)
- *175 - The maximum width of the tire is approximately 175 mm at the widest point
- *80 - Indicates the height of the sidewall is 80% of the width (in this case 140 mm)
| Older Size | Tire Size | Overall Diameter |
|---|---|---|
| - | 4.80/4.00-8 | 16.1 inches |
| - | 5.70-8 | 18.1 inches |
| 16.5 x 6.5 - 8 | 165/65-8 | 16.5 inches |
| 18.5 x 8.5 - 8 | 215/60-8 | 18.3 inches |
What is the standard size of a trailer tire?
Typical trailer wheel sizes range from 14-to-18-inch with 4 lug, 5 lug, 6 lug or 8 lug patterns. The lug pattern measures the diameter around the circle formed by the lugs on the wheel. Two numbers designate lug patterns, the first is the number of lugs on the wheel and the second is the distance measured across from each lug, or the diameter.
What size tires on a trailer?
What is the most common trailer tire size? A common trailer tire size is ST225/75R15, commonly used for travel trailers, boat trailers, pop-up campers and all high-load carrying trailers including utility. ST stands for special trailer and indicates that this tire is designed to be used on a trailer. 225 is the width of the tread in millimeters.
What the numbers on your trailer tires mean?
- ST: Stands for "Special Trailer," meant to be used on boat or utility trailers
- P: Stands for "P-metric," meant to be used on passenger vehicles, such as cars, vans, light-duty trucks and SUVs
- T: Stands for "Temporary Spare," meant to be used until the original tire can be replaced
What are the normal RV tire sizes?
What Are the Normal RV Tire Sizes? RV tire sizes are determined by the size of the rims, which are usually between 14.5 inches to 19.5 inches in diameter on the larger rigs. Half-inch measurements are typically found on heavy-duty trucks and trailers, which are used as chassis for the larger RVs.
How do I know what size trailer tire I have?
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. For example, a common trailer tire size is ST225/75R15.
What does 4.80 mean on a trailer tire?
On your current tires, the 4.80 number represents the section width of the tire, or the width across the tread. The second number is the wheel diameter size. You have a wheel that has a 8 inch diameter.
What is the difference between 5.30 and 4.80 in a trailer tire?
A 4.80-12 tire will be 20.5 inches in diameter whereas a 5.30-12 tire will be 21.9 inches. You would need to make sure that the is more than 3/4 of an inch above the 4.80-12 tire to be able to use a 5.30-12. The smaller 4.80-12 is 4.9 inches wide. The 5.30-12 is 5.6 inches wide.
Can I put bigger tires on my utility trailer?
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 wall of the tire to the trailer wall/frame.
What does 4.80 4.00 8 on a tire mean?
4″ = refers to the diameter of the rim, in inches For example, a 4.80/4.00-8″ tire typically has a 15.5″ diameter rather than the 16″ diameter you would expect. However, it is considered an adequate replacement as it meets industry standards.
Can you use car wheels on a trailer?
Can you use car tires on a trailer? (Explained) Car tires should not be used on a trailer. It is dangerous because the load difference and the size typically don't match. The sides on trailer tires are stiffer to enhance the load-bearing capacity.
How wide is a 5.30 tire?
Converting Tire Size For Bias-Ply Tire To Metric The number 5.30 on your tire is the section width of the tire which means the tire is 5.3 inches wide. For a comparable radial tire for your boat trailer you can use a tire like part #AM10130. This tire measures 5.7-inches wide.
How tall is a 5.30 x12 tire?
If you go to the 5.30 x 12 tire size, the overall diameter is 21.9 inches tall and 5.6 inches wide. The first number (4.80 or 5.30) on the tire size designates the width range of your tire in inches.
What is a tire load range?
The load range indicates the heaviest load the tire can handle in pounds. Maximum tire pressure indicates the highest you can inflate the tires, but do not fill your tires to this pressure. It reflects the highest pressure the tire can handle when carrying its maximum load.
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.
Why are trailer tires so small?
They're designed for trailer wheels, typically narrower than those on a car, and have shallower treads so they wiggle less to help improve your tow vehicle's fuel economy and run cooler.
What is the difference between a trailer tire and a regular tire?
Trailer tires have a thicker side-wall design that has a few different purposes. First, the thicker sidewall allows for heavier load bearing capacity. Second, the thicker sidewall helps to avoid trailers swaying as they travel down the road and through turns at high speeds.
What does load range B mean on trailer tires?
The stronger the reinforcements, the greater pressure the tire can hold. Most alphanumeric tires feature a load range of B, which indicates that they are restricted to the load that can be carried at a maximum inflation pressure of 32 psi.
What are the load ranges for trailer tires?
The load range is the load capacity of the trailer tire. A tire's load range is located on the sidewall of the tire. The load range is rated with a single letter, such as B, C, D, etc. If you have two tires of the same size but one with a load range of B and D, the D range tire will have a higher weight capacity.
What do the numbers on trailer Tyres mean?
Load Index markings – what the numbers mean Similar to Speed Rating, every tyre on the market has a Load Index indicator. Expressed as a two or three digit number, the load index tells you what the maximum allowed weight your tyre can carry.
How do you read wheel barrow tire size?
A common sizing system for wheelbarrow and hand-cart tires are 2 numbers, separated by a hyphen. The size could also be a series of 3 numbers separated by an “X” or a “/”. The two most common sizes are 4.00 – 6 and 4.10 – 6. The first number is the height of the tire sidewall, and the second number is the rim diameter.
What size tires are used for a trailer?
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 ...
How wide is a 225/75R15 tire?
In the case of a 225/75R15, the tire is roughly 9 inches wide, 28 inches tall and mounts on a 15 inch rim.
How much space do you need for a trailer tire?
As long as you have enough clearance for them you can upgrade to a larger tire size. We recommend having at least 2" of space from your tire sidewall to the trailer frame and then at least 4" between the tire tread and a fender to account for suspension travel. 75910
What is the tire number for Trailer King?
They will get the job done but I wouldn't say they are anything special. If you're looking for something better, then I recommend the Goodyear Endurance # 724857519 which is also available on a white wheel with a 6 on 5-1/2" bolt pattern as part # 724857519 A. 76000
How much clearance between tire and fender?
We just say to make sure you have at least 4" of clearance between the top of the tire and your fender to account for suspension travel and then at least 2" from the trailer frame to the sidewall of your tire. Trying to match you current tire dimensions is a good way to go if you know that your current tires have the proper amount of clearances. 75227
What is the difference between bias ply and radial tires?
Bias ply tires are stiffer and can handle more weight, but that also means more friction, thus more heat build up. Radials on the other hand have more flexibility. So they build less heat, but being less stiff means less weight capacity and more trailer sway. ST tires come in both bias ply and radial.
How much weight should a 7k axle tire weigh?
Weight ratings are for each individual tire so for a 7K axle you would want a tire that has a weight rating of at least 3,500 lbs so that you can be confident your tires aren't the least rated component.
What size tires should I use for a baby moon trailer?
As long as the tires are rated properly for your trailer then I don't see any reason to go larger. I would go with the White # AM20212 or Black # AM20214 wheel which will fit with the Baby Moon Hubcap # AM90086 . You can either keep your current tires or you can use something a little more heavy duty like the Kenda Karrier # AM10208 which is a load range D. 79975
How much clearance do you need for a trailer?
We recommend having at least 4" of clearance to the fender for suspension travel and 2" of clearance to the trailer frame. You might be able to use larger tires and still maintain this type of clearance but I'd need to know what kind of clearance you currently have first. 80118
What is the ply rating on trailer tires?
The ply rating on trailer tires typically varies between 2 (A) and 10 (E). This ply rating is intended to indicate the strength of the tires construction relative to other ply ratings. It doesn't necessarily mean that the tire is manufactured with this specific number of plys or layers.
What is the strength of a tire?
The strength or ply rating of the tire is positively correlated with the load capacity each tire can handle. A higher ply rating results in a stronger tire that can handle a higher load capacity.
What is the tire label on a boat trailer?
The tires on a boat trailer might be labeled: ST175/80D13 C
What is the speed of a ST trailer tire?
Unlike automotive tires, all ST tires are tested and rated at by the DOT at 65MPH. This 65MPH test allows the tire to qualify as a high speed tire. Every ST Trailer Tire you see on the highway goes through this exact same test regardless of tire size or manufacturer. The advertised load capacity on the sidewall of the tire is approved at this speed with proper inflation.
What are The Best Trailer Tires?
As with all products available on the tire market, trailer tires also have their reigning kings.
How Long do Trailer Tires Last?
All tires need to be replaced sooner or later, but what happens when said tires are not used for the majority of the year?
How to Keep Trailer Tires From Dry Rotting?
As the tires are not in use for most of the year, they are more exposed to the elements that may hurt them. The biggest issue, which WILL shorten the tires' lifespan is dry rot.
Why do trailer tires rot?
When trailer tires sit on concrete (or other surfaces which attract sunlight), they are prone to develop dry rot faster.
What is the difference between radial and bias ply tires?
Radial trailer tires are known for their heat-resistant performance, which helps them to lengthen the service life. Bias-ply tires offer better heavy load durability. You need to choose the correct tires depending on the need of your trailer.
How to store tires on a trailer?
If your trailer is not functional for months at a time, it might be best to remove the tires. Place the trailer on jacks, and bag and store the tires in your garage. The trailer itself will not be damaged by this, while the tires will be safely stored, hidden away from UV rays.
What causes a trailer tire to be damaged?
Here is a list of the most common issues which can damage trailer tires: Incorrect tire pressure levels. Exposure to moisture, sunlight, harmful temperatures, and heat build-up while in use and during storage. Exceeding their speed and load limits. Storing loaded trailers. Irregular trailer use.
