Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
185/75r14 vs 175/65r14 Tire Comparison Side By Side
  185/75-14 175/65-14 Difference
Diameter inches (mm) 24.93 (633.1) 22.96 (583.1) -1.97 (-50) -7.9%
Width inches (mm) 7.28 (185) 6.89 (175) -0.39 (-10) -5.4%
Circum. inches (mm) 78.3 (1988.94) 72.12 (1831.86) -6.18 (-157.08) -7.9%
Sidewall Height inches (mm) 5.46 (138.75) 4.48 (113.75) -0.98 (-25) -18%
Revolutions per mile (km) 809.15 (502.78) 878.53 (545.89) 69.38 (43.11) 8.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.42 mph (29.64 km/h)
25 mph (40.23 km/h)23.03 mph (37.06 km/h)
30 mph (48.28 km/h)27.63 mph (44.47 km/h)
35 mph (56.33 km/h)32.24 mph (51.88 km/h)
40 mph (64.37 km/h)36.84 mph (59.29 km/h)
45 mph (72.42 km/h)41.45 mph (66.7 km/h)
50 mph (80.47 km/h)46.05 mph (74.11 km/h)
55 mph (88.51 km/h)50.66 mph (81.52 km/h)
60 mph (96.56 km/h)55.26 mph (88.93 km/h)
65 mph (104.61 km/h)59.87 mph (96.35 km/h)
70 mph (112.65 km/h)64.47 mph (103.76 km/h)
75 mph (120.7 km/h)69.08 mph (111.17 km/h)
80 mph (128.75 km/h)73.68 mph (118.58 km/h)
85 mph (136.79 km/h)78.29 mph (125.99 km/h)
90 mph (144.84 km/h)82.89 mph (133.4 km/h)
95 mph (152.89 km/h)87.5 mph (140.81 km/h)
100 mph (160.93 km/h)92.1 mph (148.22 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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