Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
135/80r13 vs 155/80r13 Tire Comparison Side By Side
  135/80-13 155/80-13 Difference
Diameter inches (mm) 21.5 (546.2) 22.76 (578.2) 1.26 (32) 5.9%
Width inches (mm) 5.31 (135) 6.1 (155) 0.79 (20) 14.8%
Circum. inches (mm) 67.56 (1715.94) 71.51 (1816.47) 3.96 (100.53) 5.9%
Sidewall Height inches (mm) 4.25 (108) 4.88 (124) 0.63 (16) 14.8%
Revolutions per mile (km) 937.88 (582.77) 885.97 (550.52) -51.91 (-32.25) -5.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.17 mph (34.07 km/h)
25 mph (40.23 km/h)26.46 mph (42.59 km/h)
30 mph (48.28 km/h)31.76 mph (51.11 km/h)
35 mph (56.33 km/h)37.05 mph (59.63 km/h)
40 mph (64.37 km/h)42.34 mph (68.15 km/h)
45 mph (72.42 km/h)47.64 mph (76.66 km/h)
50 mph (80.47 km/h)52.93 mph (85.18 km/h)
55 mph (88.51 km/h)58.22 mph (93.7 km/h)
60 mph (96.56 km/h)63.52 mph (102.22 km/h)
65 mph (104.61 km/h)68.81 mph (110.74 km/h)
70 mph (112.65 km/h)74.1 mph (119.25 km/h)
75 mph (120.7 km/h)79.39 mph (127.77 km/h)
80 mph (128.75 km/h)84.69 mph (136.29 km/h)
85 mph (136.79 km/h)89.98 mph (144.81 km/h)
90 mph (144.84 km/h)95.27 mph (153.33 km/h)
95 mph (152.89 km/h)100.57 mph (161.85 km/h)
100 mph (160.93 km/h)105.86 mph (170.36 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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