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 195/45r14 Tire Comparison Side By Side
  195/40-14 195/45-14 Difference
Diameter inches (mm) 20.14 (511.6) 20.91 (531.1) 0.77 (19.5) 3.8%
Width inches (mm) 7.68 (195) 7.68 (195) 0 (0) 0%
Circum. inches (mm) 63.28 (1607.24) 65.69 (1668.5) 2.41 (61.26) 3.8%
Sidewall Height inches (mm) 3.07 (78) 3.45 (87.75) 0.38 (9.75) 12.5%
Revolutions per mile (km) 1001.31 (622.18) 964.55 (599.34) -36.76 (-22.84) -3.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.76 mph (33.41 km/h)
25 mph (40.23 km/h)25.95 mph (41.77 km/h)
30 mph (48.28 km/h)31.14 mph (50.12 km/h)
35 mph (56.33 km/h)36.33 mph (58.47 km/h)
40 mph (64.37 km/h)41.52 mph (66.83 km/h)
45 mph (72.42 km/h)46.72 mph (75.18 km/h)
50 mph (80.47 km/h)51.91 mph (83.53 km/h)
55 mph (88.51 km/h)57.1 mph (91.89 km/h)
60 mph (96.56 km/h)62.29 mph (100.24 km/h)
65 mph (104.61 km/h)67.48 mph (108.59 km/h)
70 mph (112.65 km/h)72.67 mph (116.95 km/h)
75 mph (120.7 km/h)77.86 mph (125.3 km/h)
80 mph (128.75 km/h)83.05 mph (133.66 km/h)
85 mph (136.79 km/h)88.24 mph (142.01 km/h)
90 mph (144.84 km/h)93.43 mph (150.36 km/h)
95 mph (152.89 km/h)98.62 mph (158.72 km/h)
100 mph (160.93 km/h)103.81 mph (167.07 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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