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.

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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…

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4.80R12 Tire Mounted On Wheel

Hi John, you did but that was six years ago and that part number with the tire mounted has since been discontinued. The answer is still the same as before, we only have them available separately.

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Yes, there is Brian. The issue is if you're actually going to need a spacer for your 2024 Toyota Tundra. How big of a lift is the rear end of your truck going to be getting and where does the rear lift install? The Air Lift LoadLifter 5000 Air…

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Difference Between Trailer Tire Sizes ST205/75R15 and ST225/75R15

The two sizes you mentioned are pretty similar and fit many of the same 15 inch wheels. The 205/75-15 fits rim widths of 5 inch to 6-1/2 inch whereas the 225/75-15 fits widths that are 5 inch to 6 inch. The 205 is 27.1 inches tall and the 225 is 28.4…

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Is There A 185/80R13 Tire Mounted On A 13" Rim With The 4 On 4 Bolt Pattern?

Hi Rob! We definitely have 13" wheels with the 4 on 4 bolt pattern and 185/80R13 tires, but we do not have any already mounted, unfortunately. The 4 on 4 bolt pattern isn't super popular with the 13" wheels for some reason, so you will…

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Can Utility Trailer go From 8 inch Trailer Tire Size to 15 inch

Hey Dave, you want to have at least 1 inch of clearance between the inner sidewall of your tire and the frame of the trailer. So what you'll need to do is determine how much clearance you have now with the current size tire that you have and…

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What is the Difference Between Load Range C and D ST175/80D13 Trailer Tires

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. For a ST175/80D13 like…

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Can a 5.30-12 Size Tire be Replaced with a ST145/R12 Size Tire

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Measurement of Hole Spacing on Torflex Lift Kit #K71-725-02

I went out into the warehouse to measure the Lift Kit #K71-725-02 for you. The holes measure 9 inches on center and 9-1/2 inches on center. I've attached a photo to assist.

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What is Best Trailer Tire in Size 5.30-12

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Does etrailer Carry Black Lug Nuts

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What is the Trailer Tire Metric Equivalent to a 4.80 x 12 Trailer Tire

The closest metric trailer tire size to a 4.80x12 is going to be a 145/80-12. The typical diameter of a 4.80x12 tire is 20.5 inches. On a 145/80-12, it is 21.3 inches. So the metric size will be a little over 1/4 inch taller. Make sure to measure the…

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