Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
165/75r14 vs 185/70r14 Tire Comparison Side By Side
  165/75-14 185/70-14 Difference
Diameter inches (mm) 23.74 (603.1) 24.2 (614.6) 0.45 (11.5) 1.9%
Width inches (mm) 6.5 (165) 7.28 (185) 0.79 (20) 12.1%
Circum. inches (mm) 74.59 (1894.69) 76.02 (1930.82) 1.42 (36.13) 1.9%
Sidewall Height inches (mm) 4.87 (123.75) 5.1 (129.5) 0.23 (5.75) 4.6%
Revolutions per mile (km) 849.39 (527.79) 833.5 (517.91) -15.89 (-9.88) -1.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.38 mph (32.8 km/h)
25 mph (40.23 km/h)25.48 mph (41 km/h)
30 mph (48.28 km/h)30.57 mph (49.2 km/h)
35 mph (56.33 km/h)35.67 mph (57.4 km/h)
40 mph (64.37 km/h)40.76 mph (65.6 km/h)
45 mph (72.42 km/h)45.86 mph (73.8 km/h)
50 mph (80.47 km/h)50.95 mph (82 km/h)
55 mph (88.51 km/h)56.05 mph (90.2 km/h)
60 mph (96.56 km/h)61.14 mph (98.4 km/h)
65 mph (104.61 km/h)66.24 mph (106.6 km/h)
70 mph (112.65 km/h)71.33 mph (114.8 km/h)
75 mph (120.7 km/h)76.43 mph (123 km/h)
80 mph (128.75 km/h)81.53 mph (131.2 km/h)
85 mph (136.79 km/h)86.62 mph (139.4 km/h)
90 mph (144.84 km/h)91.72 mph (147.6 km/h)
95 mph (152.89 km/h)96.81 mph (155.8 km/h)
100 mph (160.93 km/h)101.91 mph (164 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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