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Trailer Tire Sizing


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

C: 935 lbs at 50 psi

D: 1,165 lbs at 70 psi

18.3 inch
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 inch
-4.80-124 inch

B: 785 lbs at 60 psi

C: 990 lbs at 90 psi

20.5 inch
-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 inch
-145/80-124 inch

D: 1,220 lbs at 65 psi

E: 1,520 lbs at 80 psi

21.3 inch




13 - 14 - 15 - 16 - 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

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

225/75-156, 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
-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






















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