Trailer Tire Sizing

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

4.80/4.00-8

~4.6"

3-3/4"

B: 590 lbs at 60 psi
C: 760 lbs at 90 psi

16.1"

5.70-8

~5.8"

3-3/4"

B: 715 lbs at 50 psi
C: 910 lbs at 75 psi
D: 1,075 lbs at 100 psi

18.1"

16.5 x 6.5 - 8

165/65-8

~6.6"

5-3/8"

C: 800 lbs at 70 psi

16.5"

18.5 x 8.5 - 8

215/60-8

~8.9"

C: 935 lbs at 50 psi
D: 1,165 lbs at 70 psi

18.3"

6.90/6.00-9

~6.5"

4-1/2"

C: 1298 lbs at 60 psi

21.1"

205/50-10

~7.7"

B: 665 lbs at 30 psi

18.3"

20.5 x 8 - 10

205/65-10

~8.4"

B: 910 lbs at 35 psi
C: 1,100 lbs at 50 psi
D: 1,330 lbs at 70 psi
E: 1,650 lbs at 90 psi

20.5"

4.80-12

~4.9"

B: 785 lbs at 60 psi
C: 990 lbs at 90 psi

20.5"

5.30-12

~5.5"

B: 840 lbs at 55 psi
C: 1,045 lbs at 80 psi
D: 1,250 lbs at 105 psi

21.9"

145/80-12

~5.7"

D: 1,220 lbs at 65 psi
E: 1,520 lbs at 80 psi

21.3"

*The exact tire width varies from tire to tire. Check the section width on your tire's product page for specific measurements

13 - 14 - 15 - 16 - 17.5 Inch Trailer Tire Sizing

A78-13
B78-13

175/80-13

~6.6"

4-1/2", 5", 5-1/2"

B: 1,100 lbs at 35 psi
C: 1,360 lbs at 50 psi
D: 1,610 lbs at 65 psi

24.1"

C78-13
D78-13

185/80-13

~7.2"

4-1/2", 5", 5-1/2"

C: 1,480 lbs at 50 psi
D: 1,725 lbs at 65 psi

24.4"

F78-14
G78-14

205/75-14

~8.1"

5", 5-1/2", 6", 6-1/2"

B: 1,430 lbs at 35 psi
C: 1,760 lbs at 50 psi
D: 2,100 lbs at 65 psi

26.3"

H78-14
J78-14

215/75-14

~8.5"

5-1/2", 6", 6-1/2", 7"

C: 1,870 lbs at 50 psi

26.7"

8-14.5MH

E: 2,540 lbs at 85 psi
G: 3,070 lbs at 116 psi

27.7"

F78-15
G78-15

205/75-15

~8.1"

5", 5-1/2", 6", 6-1/2"

B: 1,480 lbs at 35 psi
C: 1,820 lbs at 50 psi
D: 2,150 lbs at 65 psi

27.1"

H78-15
J78-15

225/75-15

~8.9"

5", 6", 6-1/2", 7"

C: 2,150 lbs at 50 psi
D: 2,540 lbs at 65 psi
E: 2,961 lbs at 90 psi

28.4"

7.00-15LT

5", 5-1/2", 6"

E: 2,403 lbs at 70 psi

29.4"

235/80-16

~9.25"

6", 6-1/2", 7", 7-1/2"

D: 3,000 lbs at 65 psi
E: 3,500 lbs at 90 psi

30.9"

235/85-16

~9.37"

6", 6-1/2", 7", 7-1/2"

E: 3,640 lbs at 95 psi
F: 3,960 lbs at 110 psi

31.6"

7.50-16LT

D: 2,590 lbs at 60 psi
E: 2,926 lbs at 75 psi
F: 3,168 lbs at 85 psi

31.8"

215/75-17.5

~8.3"

6-3/4"

H (single): 4,805 lbs at 123 psi
H (dual): 4,540 lbs at 123 psi

30.2"

*The exact tire width varies from tire to tire. Check the section width on your tire's product page for specific measurements

Last Updated: 1/24/2024

Steven H.

5/18/2024

I have a 34 foot motorhome, Forest River Georgetown, and I was told the proper weight for the air is 92 pounds. I cannot find a placard anywhere and I looked in the owners manual which covers several different models but nothing specific about tire pressure in the manual. My question is this: If the tire pressure has to be 92 psi, what is the total pressure required from the compressor to pump the tires up to 92 psi? I have been told it's considerably more but until I can find out how much more, I won't know what kind of compressor to get or how to go about getting air in the tires when someone actually comes out to put it in by running a service call. Also, I can round down to 90 psi if it makes the mathematics and easier. Thank you very much for your kind reply.

Mark S.

9/9/2024

@StevenH A compressor capable of 92 psi will inflate the tire. It will be slow though as the tire and tank/compressor equalize to that pressure. Anything greater than 92 psi will allow faster filling of the tire.

Explore Expert Info

on Trailer Tires and Wheels

Videos

for Trailer Tires and Wheels

Help Articles

for Trailer Tires and Wheels

Expert Answers

for Trailer Tires and Wheels

Review of Sikaflex Lubricants Sealants Adhesives - Sealant Clear - SI95FR

Review of Kenda Trailer Tires and Wheels - Tire Only - KE75TJ

Review of Tie Down Boat Trailer Parts - Keel Roller Assembly - TD93VR

Review of Dexstar Trailer Tires and Wheels - Wheel Only - AM20545

Dexstar Steel Mini Mod Trailer Wheel Comprehensive Review and Installation

Review of TruRyde Trailer Hubs and Drums - Trailer Hub And Drum Assembly 3500LB 10 x 2-1/2 - TRU66AV

Comprehensive Review: Karrier ST205/75R14 Radial Trailer Tire w/ 14" White Spoke Wheel

Review of Tie Down Trailer Fenders - No Step Galvanized Steel - TD95VR

Review of Kenda Trailer Tires and Wheels - Karrier KR53 ST205/75R15 LRD Radial Gray Mod - KE58TJ

Tie Down Trailer Fenders Manufacturer Spotlight

Comprehensive Review: Torflex Lift Kit

Review of Kenda Trailer Tires and Wheels - Tire with Wheel - KE46TJ

7 Common Questions Everyone Has About Trailer Tires

How to Measure Your Trailer Wheel Bolt Pattern

How to Determine Tire/Wheel Diameter

Printable Trailer Bolt Hole Pattern Template

How to Raise Your Travel Trailer Height

Trailer Lighting Requirements

Ram Trailer Tow Prep Package

What is the Best Trailer or RV Storage Cover

How to Level a Travel Trailer in 3 Steps

Practice Safe Trailer Towing with These 4 Tips

Trailer Wiring Diagrams

How to Tell the Weight Rating of a Trailer Axle

Furrion Chill Cube Options for Travel Trailer

Hey Stephen! If you're replacing your existing RV air conditioner with a Furrion Chill Cube system, you'll need three main components: the rooftop AC, an air distribution box, and either a remote control or thermostat (depending on the system…

view full answer...

Replacement Brake Assemblies and Hubs for a 3,500 lbs Axle

They sure will Craig! Your 2014 Jayco Jayfeather Ultralite x17z camper has a 3,500 lbs axle. Our etrailer Electric Trailer Brakes item #AKEBRK-35-SA will fit perfectly! For a replacement hub, I recommend the Easy Grease Trailer Hub and Drum Assembly…

view full answer...

Furrion Chill Cube Non Ducted AC with Oscillating Air Distribution Box for Improved RV Airflow

John, that is a completely valid concern, especially since you already went through the trouble of switching from the horizontal air distribution box to the lateral version just to improve airflow throughout your R Pod. The last thing you want is to…

view full answer...

Best Weight Distribution System For A 2026 Winnebago 2000MRB

Hi Jim! With your 2026 Winnebago 2000MRB having a 5,500 pounds GVMR, I think the Curt TruTrack Weight Distribution System #C17499 is going to be a little overrated for you. Your loaded tongue weight should be as close to the middle of the systems…

view full answer...

Furrion Chill Cube 18K AC Installation Differences vs Coleman Mach in 2024 Winnebago Vita 24P

Rick, you definitely picked one of the nicest RV AC systems out there with the Furrion Chill Cube part #FR49TD. I completely understand wanting to know how involved the install will be before diving into it because nobody wants to get halfway through…

view full answer...

Would Lift Kit for 2006 Jayco Pop Up Allow for Off Road Tires

Hey JP, with the Torflex lift kit part #K71-707-01 you would give your Jayco a lift of 2-5/8 inches but that's not enough information for me to know if that would allow you to run a larger wheel and tire. I would need to know what size tire you…

view full answer...

Which is Better for Highway Use 4.80-12 or 5.30-12 Trailer TIres

The 5.30-12 tires, being wider, are going to make more contact with the road. This means that the noise, and heat build up will be higher than a 4.80-12 tire but the rolling resistance will actually be less because the tire is larger diameter. The…

view full answer...

Does a Wheel's Width Matter When Buying a Tire?

Hey there! I can definitely see why that would be confusing. Tire width and wheel width get listed separately, but they do affect each other a little bit. The tire width we list is based on a specific “measuring rim width” used by the tire…

view full answer...

Comparing Kenda KR03, KR35, And KR53 Tires

Hey Bryan, that's a good question. The pricing can definitely be misleading, but I wouldn't use it to judge the quality of the tire. A lot of that comes down to promotions, inventory, and whether you're looking at a tire by itself or…

view full answer...

Will the PopStep Gap Guard PS29UR and the PopStep for 19-1/2" Treads PS47UR Work Together?

Hey Steve. The PopStep Gap Guard for MORryde StepAbove 19.5" and Lippert SolidStep 20" - 3-Step item #PS29UR are going to be compatible with the PopStep for MORryde StepAbove - 3 Step - 19-1/2" Treads item #PS47UR. We've actually…

view full answer...

Would a Timbren Suspension Enhancement System be able to Replace a Weight Distribution

Thanks for your question, Steve. Installing the Timbren Rear Suspension Enhancement System #T76FR wouldn’t eliminate the need for a weight distribution system if your setup calls for one, they actually serve two different purposes. A weight…

view full answer...

Comparing the eTrailer and Dexter Electric Trailer Brake Kits

I currently have four different self-adjusting assemblies for your boat trailer with 10" x 2-1/4" electric drum brakes. You can choose from the following: -Terran Axle Electric Trailer Brakes #TX97ZJ (3,500 Axles) -etrailer Electric Trailer…

view full answer...