Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
135/70r15 vs 155/70r15 Tire Comparison Side By Side
  135/70-15 155/70-15 Difference
Diameter inches (mm) 22.44 (570) 23.54 (598) 1.1 (28) 4.9%
Width inches (mm) 5.31 (135) 6.1 (155) 0.79 (20) 14.8%
Circum. inches (mm) 70.5 (1790.71) 73.96 (1878.67) 3.46 (87.96) 4.9%
Sidewall Height inches (mm) 3.72 (94.5) 4.27 (108.5) 0.55 (14) 14.8%
Revolutions per mile (km) 898.72 (558.44) 856.64 (532.29) -42.08 (-26.15) -4.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.98 mph (33.77 km/h)
25 mph (40.23 km/h)26.23 mph (42.21 km/h)
30 mph (48.28 km/h)31.47 mph (50.65 km/h)
35 mph (56.33 km/h)36.72 mph (59.09 km/h)
40 mph (64.37 km/h)41.96 mph (67.54 km/h)
45 mph (72.42 km/h)47.21 mph (75.98 km/h)
50 mph (80.47 km/h)52.46 mph (84.42 km/h)
55 mph (88.51 km/h)57.7 mph (92.86 km/h)
60 mph (96.56 km/h)62.95 mph (101.3 km/h)
65 mph (104.61 km/h)68.19 mph (109.75 km/h)
70 mph (112.65 km/h)73.44 mph (118.19 km/h)
75 mph (120.7 km/h)78.68 mph (126.63 km/h)
80 mph (128.75 km/h)83.93 mph (135.07 km/h)
85 mph (136.79 km/h)89.18 mph (143.51 km/h)
90 mph (144.84 km/h)94.42 mph (151.96 km/h)
95 mph (152.89 km/h)99.67 mph (160.4 km/h)
100 mph (160.93 km/h)104.91 mph (168.84 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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