Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
145/60r15 vs 195/50r15 Tire Comparison Side By Side
  145/60-15 195/50-15 Difference
Diameter inches (mm) 21.85 (555) 22.68 (576) 0.83 (21) 3.8%
Width inches (mm) 5.71 (145) 7.68 (195) 1.97 (50) 34.5%
Circum. inches (mm) 68.65 (1743.58) 71.24 (1809.56) 2.6 (65.97) 3.8%
Sidewall Height inches (mm) 3.43 (87) 3.84 (97.5) 0.41 (10.5) 12.1%
Revolutions per mile (km) 923.01 (573.53) 889.36 (552.62) -33.65 (-20.91) -3.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.76 mph (33.4 km/h)
25 mph (40.23 km/h)25.95 mph (41.76 km/h)
30 mph (48.28 km/h)31.14 mph (50.11 km/h)
35 mph (56.33 km/h)36.32 mph (58.46 km/h)
40 mph (64.37 km/h)41.51 mph (66.81 km/h)
45 mph (72.42 km/h)46.7 mph (75.16 km/h)
50 mph (80.47 km/h)51.89 mph (83.51 km/h)
55 mph (88.51 km/h)57.08 mph (91.86 km/h)
60 mph (96.56 km/h)62.27 mph (100.21 km/h)
65 mph (104.61 km/h)67.46 mph (108.57 km/h)
70 mph (112.65 km/h)72.65 mph (116.92 km/h)
75 mph (120.7 km/h)77.84 mph (125.27 km/h)
80 mph (128.75 km/h)83.03 mph (133.62 km/h)
85 mph (136.79 km/h)88.22 mph (141.97 km/h)
90 mph (144.84 km/h)93.41 mph (150.32 km/h)
95 mph (152.89 km/h)98.59 mph (158.67 km/h)
100 mph (160.93 km/h)103.78 mph (167.02 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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