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Trailer Tire Sizing


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

Older SizeTire SizeRim WidthLoad RangeOverall Diameter
-4.80/4.00-83-3/4 inch

B: 590 lbs at 60 psi

C: 760 lbs at 90 psi

16.1 inches
-5.70-83-3/4 inch

B: 715 lbs at 50 psi

C: 910 lbs at 75 psi

D: 1,075 lbs at 100 psi

18.1 inches
16.5 x 6.5 - 8165/65-85-3/8 inchC: 800 lbs at 70 psi16.5 inches
18.5 x 8.5 - 8215/60-87 inch

C: 935 lbs at 50 psi

D: 1,165 lbs at 70 psi

18.3 inches
-6.90/6.00-94-1/2 inch

C: 1298 lbs at 60 psi

21.1 inches
-205/50-106 inch

B: 665 lbs at 30 psi

18.3 inches
20.5 x 8 - 10205/65-106 inch

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 inches
-4.80-124 inch

B: 785 lbs at 60 psi

C: 990 lbs at 90 psi

20.5 inches
-5.30-124 inch

B: 840 lbs at 55 psi

C: 1,045 lbs at 80 psi

D: 1,250 lbs at 105 psi

21.9 inches
-145/80-124 inch

D: 1,220 lbs at 65 psi

E: 1,520 lbs at 80 psi

21.3 inches




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

Letter SizeMetric SizeRim Width RangeLoad RangeOverall Diameter

A78-13

B78-13

175/80-134-1/2, 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 inches

C78-13

D78-13

185/80-134-1/2, 5, 5-1/2

C: 1,480 lbs at 50 psi

D: 1,725 lbs at 65 psi

24.4 inches

F78-14

G78-14

205/75-145, 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 inches

H78-14

J78-14

215/75-145-1/2, 6, 6-1/2, 7 C: 1,870 lbs at 50 psi26.7 inches
-8-14.5MH6 inch

E: 2,540 lbs at 85 psi

G: 3,070 lbs at 116 psi

27.7 inches

F78-15

G78-15

205/75-155, 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 inches

H78-15

J78-15

225/75-155, 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 inches
-7.00-15LT5, 5-1/2, 6

E: 2,403 lbs at 70 psi

29.4 inches
-235/80-166, 6-1/2, 7, 7-1/2

D: 3,000 lbs at 65 psi

E: 3,500 lbs at 90 psi

30.9 inches
-235/85-166, 6-1/2, 7, 7-1/2

E: 3,640 lbs at 95 psi

F: 3,960 lbs at 110 psi

31.6 inches
-7.50-16LT6

D: 2,590 lbs at 60 psi

E: 2,926 lbs at 75 psi

F: 3,168 lbs at 85 psi

31.8 inches
-215/75-17.56-3/4 inch

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

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

30.2 inches




Gene

11/5/2022

I am a new boat owner,the tires on my boat trailer 175/80D but the tires look to high on the fenders or not to much room at the top between the tires and fender,the boat is used and trailer,just want to know how much space is safe

Etrailer Expert

David B.

11/11/2022

In theory you could have 1mm and it be safe if there isn't any bumps. If the trailer is used I would just poke my head under the fender and look to see if the tire was actually making contact and rubbing on anything. If you don't see any evidence of that you will be good to go Gene. If you see skid marks on the fender or anything like that you would want to consider a lower profile tire. Honestly though since it is used and those tires are probably what has been used on it for some time I would say you are safe.

Anthony R.

8/7/2022

Help please, I need new tires for my boat trailer but I’m having a hard time finding the right size. They are dry rotted and worn. I can see it says 6.00-9 and C-214-1 they are tow master brand. What would the correct size be for them. What is a compatible tire and rim? It’s a 5 lug rim and tubeless tire. Thank you

Etrailer Expert

David B.

8/8/2022

You will need something like this Kenda Loadstar K364 Trailer Tire - 6.90/6.00-9 - Load Range C # AM10040 . I recommend getting a tape measure out and verify that what you have matches this # AM10040 . You can find the tires specs listed on the product page. It will tell you the rims that it will fit, give you the section width and outer diameter when inflated plus the load range and other needed info.

Simon

7/15/2022

I am considering buying a motorcycle trailer but it's tires definitely need to be replaced. It is currently running 4.80 x 8. I am MOST concerned with finding tires that have a max speed closer to 120 km/hr or 75 mph. What can you recommend?

Etrailer Expert

David B.

7/26/2022

Hey Simon, if you have a 4 on 4 this might work for you. The Taskmaster 4.80/4.00-8 Bias Trailer Tire w/ 8" Solid Center Wheel - 4 on 4 - Load Range B # AS4808B4WS . Make sure you read over all the specs on the product page and verify that it will work with your trailer and hubs. Also make sure your trailer can go faster too. The bearings and hubs may not be rated for higher speeds.

Smitty

6/2/2022

I have a 14 ft boat. What size tires are the best

Etrailer Expert

David B.

6/2/2022

Check out the linked faq page Smitty. I think it will help you make a choice about your tire selection. Once you have gone over it let me know and I can help you with sizes and all that jazz.

Mike M.

6/1/2022

I have pair of ST205/75d15 load-C, I am looking to replace with heavier duty tire. Is the total tire diameter greater when you move up to load range D?

Etrailer Expert

David B.

6/1/2022

A bigger load range doesn't always mean the tire size will be different for example these two tire/wheel combos have the same dimensions but one is load range C and the other is D. # AM32238B # WST44FR . I have linked to our webpage that has load range D tires/wheels that are in the ST205/75d15, ST225/75d15 and ST235/75d15category.


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