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 195/65r15 Tire Comparison Side By Side
  185/70-14 195/65-15 Difference
Diameter inches (mm) 24.2 (614.6) 24.98 (634.5) 0.78 (19.9) 3.2%
Width inches (mm) 7.28 (185) 7.68 (195) 0.39 (10) 5.4%
Circum. inches (mm) 76.02 (1930.82) 78.48 (1993.34) 2.46 (62.52) 3.2%
Sidewall Height inches (mm) 5.1 (129.5) 4.99 (126.75) -0.11 (-2.75) -2.1%
Revolutions per mile (km) 833.5 (517.91) 807.36 (501.67) -26.14 (-16.24) -3.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.65 mph (33.23 km/h)
25 mph (40.23 km/h)25.81 mph (41.54 km/h)
30 mph (48.28 km/h)30.97 mph (49.84 km/h)
35 mph (56.33 km/h)36.13 mph (58.15 km/h)
40 mph (64.37 km/h)41.3 mph (66.46 km/h)
45 mph (72.42 km/h)46.46 mph (74.77 km/h)
50 mph (80.47 km/h)51.62 mph (83.07 km/h)
55 mph (88.51 km/h)56.78 mph (91.38 km/h)
60 mph (96.56 km/h)61.94 mph (99.69 km/h)
65 mph (104.61 km/h)67.1 mph (107.99 km/h)
70 mph (112.65 km/h)72.27 mph (116.3 km/h)
75 mph (120.7 km/h)77.43 mph (124.61 km/h)
80 mph (128.75 km/h)82.59 mph (132.92 km/h)
85 mph (136.79 km/h)87.75 mph (141.22 km/h)
90 mph (144.84 km/h)92.91 mph (149.53 km/h)
95 mph (152.89 km/h)98.08 mph (157.84 km/h)
100 mph (160.93 km/h)103.24 mph (166.15 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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