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 195/65r15 Tire Comparison Side By Side
  185/75-14 195/65-15 Difference
Diameter inches (mm) 24.93 (633.1) 24.98 (634.5) 0.06 (1.4) 0.2%
Width inches (mm) 7.28 (185) 7.68 (195) 0.39 (10) 5.4%
Circum. inches (mm) 78.3 (1988.94) 78.48 (1993.34) 0.17 (4.4) 0.2%
Sidewall Height inches (mm) 5.46 (138.75) 4.99 (126.75) -0.47 (-12) -8.6%
Revolutions per mile (km) 809.15 (502.78) 807.36 (501.67) -1.79 (-1.11) -0.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.04 mph (32.26 km/h)
25 mph (40.23 km/h)25.06 mph (40.32 km/h)
30 mph (48.28 km/h)30.07 mph (48.39 km/h)
35 mph (56.33 km/h)35.08 mph (56.45 km/h)
40 mph (64.37 km/h)40.09 mph (64.52 km/h)
45 mph (72.42 km/h)45.1 mph (72.58 km/h)
50 mph (80.47 km/h)50.11 mph (80.65 km/h)
55 mph (88.51 km/h)55.12 mph (88.71 km/h)
60 mph (96.56 km/h)60.13 mph (96.77 km/h)
65 mph (104.61 km/h)65.14 mph (104.84 km/h)
70 mph (112.65 km/h)70.15 mph (112.9 km/h)
75 mph (120.7 km/h)75.17 mph (120.97 km/h)
80 mph (128.75 km/h)80.18 mph (129.03 km/h)
85 mph (136.79 km/h)85.19 mph (137.1 km/h)
90 mph (144.84 km/h)90.2 mph (145.16 km/h)
95 mph (152.89 km/h)95.21 mph (153.23 km/h)
100 mph (160.93 km/h)100.22 mph (161.29 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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