Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
195/40r14 vs 155/55r14 Tire Comparison Side By Side
  195/40-14 155/55-14 Difference
Diameter inches (mm) 20.14 (511.6) 20.71 (526.1) 0.57 (14.5) 2.8%
Width inches (mm) 7.68 (195) 6.1 (155) -1.57 (-40) -20.5%
Circum. inches (mm) 63.28 (1607.24) 65.07 (1652.79) 1.79 (45.55) 2.8%
Sidewall Height inches (mm) 3.07 (78) 3.36 (85.25) 0.29 (7.25) 9.3%
Revolutions per mile (km) 1001.31 (622.18) 973.71 (605.04) -27.6 (-17.15) -2.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.57 mph (33.1 km/h)
25 mph (40.23 km/h)25.71 mph (41.37 km/h)
30 mph (48.28 km/h)30.85 mph (49.65 km/h)
35 mph (56.33 km/h)35.99 mph (57.92 km/h)
40 mph (64.37 km/h)41.13 mph (66.2 km/h)
45 mph (72.42 km/h)46.28 mph (74.47 km/h)
50 mph (80.47 km/h)51.42 mph (82.75 km/h)
55 mph (88.51 km/h)56.56 mph (91.02 km/h)
60 mph (96.56 km/h)61.7 mph (99.3 km/h)
65 mph (104.61 km/h)66.84 mph (107.57 km/h)
70 mph (112.65 km/h)71.98 mph (115.85 km/h)
75 mph (120.7 km/h)77.13 mph (124.12 km/h)
80 mph (128.75 km/h)82.27 mph (132.4 km/h)
85 mph (136.79 km/h)87.41 mph (140.67 km/h)
90 mph (144.84 km/h)92.55 mph (148.95 km/h)
95 mph (152.89 km/h)97.69 mph (157.22 km/h)
100 mph (160.93 km/h)102.83 mph (165.5 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
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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