Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
245/75r19.5 vs 360/65r17.5 Tire Comparison Side By Side
  245/75-19.5 360/65-17.5 Difference
Diameter inches (mm) 33.97 (862.8) 35.93 (912.5) 1.96 (49.7) 5.8%
Width inches (mm) 9.65 (245) 14.17 (360) 4.53 (115) 46.9%
Circum. inches (mm) 106.72 (2710.57) 112.86 (2866.7) 6.15 (156.14) 5.8%
Sidewall Height inches (mm) 7.23 (183.75) 9.21 (234) 1.98 (50.25) 27.3%
Revolutions per mile (km) 593.73 (368.93) 561.39 (348.83) -32.34 (-20.09) -5.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.15 mph (34.04 km/h)
25 mph (40.23 km/h)26.44 mph (42.55 km/h)
30 mph (48.28 km/h)31.73 mph (51.06 km/h)
35 mph (56.33 km/h)37.02 mph (59.57 km/h)
40 mph (64.37 km/h)42.3 mph (68.08 km/h)
45 mph (72.42 km/h)47.59 mph (76.59 km/h)
50 mph (80.47 km/h)52.88 mph (85.1 km/h)
55 mph (88.51 km/h)58.17 mph (93.61 km/h)
60 mph (96.56 km/h)63.46 mph (102.12 km/h)
65 mph (104.61 km/h)68.74 mph (110.63 km/h)
70 mph (112.65 km/h)74.03 mph (119.14 km/h)
75 mph (120.7 km/h)79.32 mph (127.65 km/h)
80 mph (128.75 km/h)84.61 mph (136.16 km/h)
85 mph (136.79 km/h)89.9 mph (144.67 km/h)
90 mph (144.84 km/h)95.18 mph (153.18 km/h)
95 mph (152.89 km/h)100.47 mph (161.69 km/h)
100 mph (160.93 km/h)105.76 mph (170.21 km/h)

Gear Ratio / RPMs for New Tire (@ 65 mph)
2.35 2.73 2.94 3.07 3.21 3.31 3.42 3.55 3.73 3.91 4.11 4.27 4.56 4.88 5.13 5.29 5.38 5.71 6.17 7.17
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