Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
185/70r14 vs 185/65r15 Tire Comparison Side By Side
  185/70-14 185/65-15 Difference
Diameter inches (mm) 24.2 (614.6) 24.47 (621.5) 0.27 (6.9) 1.1%
Width inches (mm) 7.28 (185) 7.28 (185) 0 (0) 0%
Circum. inches (mm) 76.02 (1930.82) 76.87 (1952.5) 0.85 (21.68) 1.1%
Sidewall Height inches (mm) 5.1 (129.5) 4.73 (120.25) -0.36 (-9.25) -7.1%
Revolutions per mile (km) 833.5 (517.91) 824.25 (512.16) -9.25 (-5.75) -1.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.22 mph (32.55 km/h)
25 mph (40.23 km/h)25.28 mph (40.69 km/h)
30 mph (48.28 km/h)30.34 mph (48.82 km/h)
35 mph (56.33 km/h)35.39 mph (56.96 km/h)
40 mph (64.37 km/h)40.45 mph (65.1 km/h)
45 mph (72.42 km/h)45.51 mph (73.23 km/h)
50 mph (80.47 km/h)50.56 mph (81.37 km/h)
55 mph (88.51 km/h)55.62 mph (89.51 km/h)
60 mph (96.56 km/h)60.67 mph (97.64 km/h)
65 mph (104.61 km/h)65.73 mph (105.78 km/h)
70 mph (112.65 km/h)70.79 mph (113.92 km/h)
75 mph (120.7 km/h)75.84 mph (122.06 km/h)
80 mph (128.75 km/h)80.9 mph (130.19 km/h)
85 mph (136.79 km/h)85.95 mph (138.33 km/h)
90 mph (144.84 km/h)91.01 mph (146.47 km/h)
95 mph (152.89 km/h)96.07 mph (154.6 km/h)
100 mph (160.93 km/h)101.12 mph (162.74 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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