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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



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



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



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



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



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



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

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



Hello: I recently purchased a 2019 ITI enclosed cargo trailer. It is being worked on remotely so I don't have it to refer to, but I believe it has a 5 bolt wheel. What is the correct size wheel and pattern to buy for a spare? Thanks Chuck

Etrailer Expert

Mike L.


@Chuck What are the dimensions of the cargo box? Tandem or single axle? Axle capacity? The 6, 7 and 8-foot wide models with the 7K axles use 205/75R15 tires. 7 and 8-foot wide models with the 10K axles use 225/75R15 tires. 8-foot wide models with the 14K axles use 235/80R16 tires. Hope that helps!



I bought a used boat with a trailer. The guy recently replaced the tires but they look flat. When I check the PSI they are within normal range. Could this be a sign that the boat and trailer are too heavy for the tires? After I tow the boat for some distance, the tires are pretty hot.

Etrailer Expert

Mike L.


@Jamie It sounds like that very well might be the case. Check the ID plate on the trailer which will sometimes list the correct tire size. The GVWR should be listed there too. Get me that info, as well as the size of the tires currently on there and we'll get you a recommendation for replacements.



@MikeL couldn’t find anything on the trailer listing tire size. But the trailer is a venture boat trailer for 16-17’ boats. This is what is listed on the website. Tire Size: ST 175 / 80D 13 LRC 5H
Etrailer Expert

Mike L.


@Jamie A 175/80-13 load range C tire will have a capacity of 1360 lbs per tire. If the weight of the trailer + boat exceeds the combined weight capacity of the tires, you'll want to upgrade to a D load range which has a 1610 lb per tire capacity. We offer the load range D wire mounted on a galvanized rim with a 5-on 4-1/2 inch bolt pattern as # AM31994. We'd recommend getting that boat and trailer weighed, so you'll know how to proceed from here.



I’ve recently bought a new boat and the tires on there are 155/80/13 but I can’t find those for a trailer on for a car but I wanted to know what is the other size I could use

Etrailer Expert

Heather A.


@Blake The tires on your new to you boat trailer are no longer made. The best replacement is going to be a ST175/80R13 like part # AM10199. These will be about 1 inch taller overall and 3/4 of an inch wider. You just want to make sure you have clearance to get a larger tire. The rule of thumb is that you want enough clearance for your trailer travel over potholes that normally requires 3-4 inches between the tire tread and fenders. You also need 1-2 inches between the sidewall and inside of the wheel well.

Art W.


I have old tires on a trailer. The rims are 5 bolt at 4 3/4” (centre to centre). The tires size is 6.00 S 15. Can these still be bought?

Etrailer Expert

Mike L.


@ArtW A 205/75-15 is a pretty close modern equivalent. We offer it mounted on a 15 x 5 silver powder coated wheel with a 5 on 4-3/4 Inch bolt pattern as part #

J W.


I just bought a kayak trailer and it has 12inch wheels, 4.80/4.00-8, c load range. How many miles should I expect to get on these? If it matters ( 2 kayaks about 300lbs)

Etrailer Expert

Mike L.


@JW The tire manufacturer might be able to shed some light on that for you, but to be perfectly honest, most trailer tires will 'age out' before the tread is worn enough to warrant replacement. After roughly 4-5 years, you'll want to replace the tires as after that point they'll start to dry rot. This is a bit different from automotive tires, because most trailer tires don't get tons of miles put on them. I'll link to an article that has much more info about trailer tires, which I hope you'll find helpful. The article will explain how to read the date code on the tire so you can determine its age.



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