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Rv Tire Size Chart And Sizing Guide

December 23, 2021December 23, 2021 by Joe

What does RV stand for and what is the use of an RV tire size chart? RV is the abbreviation for a recreational vehicle. The vehicle can be a full-fledged truck with a living area or a trailer specifically constructed for living in. An RV tire size chart is used to guide shoppers on sizes.

Recreational vehicles have developed into a variety of designs and sizes. All RVs, however, have one thing in common: they are all a home away from home, providing a place to sleep, eat, and wash up while traveling.

RV Tire Size Chart

There are various reasons you should use an RV tire size chart while looking for the correct tire size. Your RV’s tires bear the heavy loads of the vehicle and are the only portions of it that contact the road. When it’s time to buy new tires, making sure you get the right size is crucial to the health of your tires and motorhome. Other important aspects worth considering include actual speed (not forgetting speed limits), road surfaces, tire code, class of tire, wheel chocks, wheel surface, grip on snow (including deep snow, packed snow, etc), traction on snow, single load capacity, load range, construction type.

Use the chart below for reference.

Trailer Sizing ( 13 – 14 – 15 – 16 – 17.5 Inch )

Size (Letter )	Size (Metric)	Width Range (Rim)	Diameter (Overall)
			INCHES	CM
A78-13 B78-13	175/80-13	4-1/2, 5, 5-1/2	24.1	61.2
C78-13 D78-13	185-80-13	4-1/2, 5, 5-1/2	24.4	62.0
F78-14 G78-14	205/75-14	5, 5-1/2, 6, 6-1/2	26.3	66.8
H78-14 J78-14	215/75-14	5-1/2, 6, 6-1/2, 7	26.7	67.8
F78-15 G78-15	205/75-15	5, 5-1/2, 6, 6-1/2	27.1	68.8
H78-15 J78-15	225/75-15	5, 6, 6-1/2, 7	28.4	72.1

Because a tire’s function is to carry and direct your vehicle, when one is too big or too little, not only is performance hampered but your safety is also threatened. Using an rv tire size chart to determine the right tire size for your RV may save you time and money. All tires have their sizes indicated right on the sidewall. So you need to know this size before you go shopping.

Load Range Chart

Make use of these charts ply ratings and load range.

Load Range	A	B	C	D	E	F	G	H	J	L	M	N
Ply Rating	2	4	6	8	10	12	14	16	18	20	22	24

Illustrative Example (Max pressure)

Load Range	B	C	D	E	F
Ply rating	4	6	8	10	12
Max Pressure (PSI)	35	50	65	80	95

How to read an RV Tire Size on tires?

Here are the essential items that makeup up an RV tire size;

1. Types of Tire

This refers to the service or kind of vehicle for which the tire was built. Usually, the letter P refers to the passenger, the most prevalent tire type. Another tire type you’ll come across is C for a commercial tire. If there is no letter, the tire was likely made in Europe for European vehicles. Such a tire is known as a metric tire, and it is comparable to a passenger vehicle tire in many aspects.

2. Tire Width

This is the distance from sidewall to sidewall across the width of your tire, measured in millimeters.

3. Aspect Ratio

Aspect ratio refers to the percentage of the connection between the tire sidewall height and width. You can use the distance between the edge of the rim and the top of the tire at the borders of the tread pattern to calculate sidewall height. The aspect ratio of your vehicle determines how effectively the vehicle can handle the tire.

4. Type of Construction

This is simply the way the tire was made, also referred to as internal construction. There are two different types of construction, for;

Radial tire
Ply tire

Radial tires are the most frequent type of tire in the United States. Radial tires are made by stacking piles parallel to the direction of travel, resulting in a smoother ride, longer tread life, and lower fuel use.

5. Rim Diameter/Wheel Size

Wheel size relates to your wheel diameter and tire diameter by extension. It is measured across the middle of the tire in inches. The rim diameter is frequently used as a shorthand for the tire size that your motor home requires.

6. Load Index

When a tire is completely inflated, the load index is a shorthand way of stating the entire weight it can carry. The load index value indicates the total weight the tire can handle. To discover how your load index rating corresponds to the amount of weight your tire can bear, you’ll need a tire-load index rating chart.

7. Speed Rating

It refers to how quickly a tire is meant to go. It is denoted with a letter corresponding to the tire’s maximum speed.

Tire Sizing Guide

What makes RV tires unique? The tires on an RV are not the same as those on a regular car. Because of its weight and the heavy loads, you’ll need tires that can support a much larger cargo load than standard vehicle tires.

RV trailer tires’ design, construction, and purpose are all unique. There are various sizes to match your RV, and multiple tires are designed to support varying weight loads. Understanding which tires are appropriate for you can help you prevent costly breakouts and enjoy smoother, more pleasant rides.

Classes of RV Tires

RV tires are divided into three categories, each built to carry a particular amount of weight.

Class A Motorhome Tires

This category is for big RVs since they are the most oversized tires available for recreational vehicles. They can also fit inside a 40-foot RV. These are the RVs that are based on the bus chassis.

Class B Motorhome Tires

The most undersized tires are classified as Class B. They can only transport cargo weighing between 6,000 and 8,000 pounds, and they should only be used on RVs with a body length of 17 to 19 feet. These are usually built on the chassis of a van or, in some cases, a truck.

Class C Motorhome Tires

These may support up to 2,000 pounds of weight. These tires are typically suggested for RVs with a length of 20 to 30 feet.

RV Tire Size Types

There are two main categories of RV tires, as follows;

All-position Commercial Truck Tires

All-position Commercial Truck Tires are ideal for Class A Recreational vehicles

For correct weight load rating and speed index, these tires are necessary. Only all-position tires can effectively steer and control an RV. Thus, other commercial truck tires are not suited.

Highway Truck Tires

Highway Truck Tires are ideal for Class B and C Recreational vehicles.

They will use light truck tires because they construct most Class B and C RVs on van or truck chassis. Unless you’re driving primarily off-road, in that case, consider an AT tire, choose Highway tires for the smoothest ride and most incredible mileage.

Conclusion on RV Tire Sizing

When shopping for new tires for your RV, consult a tire professional if you’re unclear how to read tire measures from a tire size chart and the tire walls. This is because various options of tire sizes may have different load capabilities and may need wheels with varying widths of rim or diameters, as well as other inflation pressures. You can also use a tire size calculator (tire size comparison calculator) as a convenient guide to compare alternate tire sizes. Remember to stay safe even as you stay in your RV van, always.

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