Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
185/60r16 vs 195/70r15 Tire Comparison Side By Side
  185/60-16 195/70-15 Difference
Diameter inches (mm) 24.74 (628.4) 25.75 (654) 1.01 (25.6) 4.1%
Width inches (mm) 7.28 (185) 7.68 (195) 0.39 (10) 5.4%
Circum. inches (mm) 77.72 (1974.18) 80.89 (2054.6) 3.17 (80.42) 4.1%
Sidewall Height inches (mm) 4.37 (111) 5.37 (136.5) 1 (25.5) 23%
Revolutions per mile (km) 815.2 (506.54) 783.29 (486.71) -31.91 (-19.83) -3.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.81 mph (33.5 km/h)
25 mph (40.23 km/h)26.02 mph (41.87 km/h)
30 mph (48.28 km/h)31.22 mph (50.25 km/h)
35 mph (56.33 km/h)36.43 mph (58.62 km/h)
40 mph (64.37 km/h)41.63 mph (67 km/h)
45 mph (72.42 km/h)46.83 mph (75.37 km/h)
50 mph (80.47 km/h)52.04 mph (83.75 km/h)
55 mph (88.51 km/h)57.24 mph (92.12 km/h)
60 mph (96.56 km/h)62.44 mph (100.49 km/h)
65 mph (104.61 km/h)67.65 mph (108.87 km/h)
70 mph (112.65 km/h)72.85 mph (117.24 km/h)
75 mph (120.7 km/h)78.06 mph (125.62 km/h)
80 mph (128.75 km/h)83.26 mph (133.99 km/h)
85 mph (136.79 km/h)88.46 mph (142.37 km/h)
90 mph (144.84 km/h)93.67 mph (150.74 km/h)
95 mph (152.89 km/h)98.87 mph (159.12 km/h)
100 mph (160.93 km/h)104.07 mph (167.49 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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