Trailer Tire Sizing

8 - 10 - 12 - Inch Trailer Tire Sizing

Older Size	Tire Size	Rim Width	Load Range	Overall Diameter
-	4.80/4.00-8	3-3/4 inch	B: 590 lbs at 60 psi C: 760 lbs at 90 psi	16.1 inch
-	5.70-8	3-3/4 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 - 8	165/65-8	5-3/8 inch	C: 800 lbs at 70 psi	16.5 inch
18.5 x 8.5 - 8	215/60-8	7 inch	C: 935 lbs at 50 psi D: 1,165 lbs at 70 psi	18.3 inch
20.5 x 8 - 10	205/65-10	6 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
-	4.80-12	4 inch	B: 785 lbs at 60 psi C: 990 lbs at 90 psi	20.5 inch
-	5.30-12	4 inch	B: 840 lbs at 55 psi C: 1,045 lbs at 80 psi D: 1,250 lbs at 105 psi	21.9 inch
-	145/80-12	4 inch	D: 1,220 lbs at 65 psi E: 1,520 lbs at 80 psi	21.3 inch

Letter Size	Metric Size	Rim Width Range	Load Range	Overall Diameter
A78-13 B78-13	175/80-13	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 inches
C78-13 D78-13	185/80-13	4-1/2, 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	205/75-14	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 inches
H78-14 J78-14	215/75-14	5-1/2, 6, 6-1/2, 7	C: 1,870 lbs at 50 psi	26.7 inches
F78-15 G78-15	205/75-15	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 inches
H78-15 J78-15	225/75-15	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
-	235/80-16	6, 6-1/2, 7, 7-1/2	D: 3,000 lbs at 65 psi E: 3,500 lbs at 90 psi	30.9 inches
-	235/85-16	6, 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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