Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
195/40r14 vs 185/60r14 Tire Comparison Side By Side
  195/40-14 185/60-14 Difference
Diameter inches (mm) 20.14 (511.6) 22.74 (577.6) 2.6 (66) 12.9%
Width inches (mm) 7.68 (195) 7.28 (185) -0.39 (-10) -5.1%
Circum. inches (mm) 63.28 (1607.24) 71.44 (1814.58) 8.16 (207.35) 12.9%
Sidewall Height inches (mm) 3.07 (78) 4.37 (111) 1.3 (33) 42.3%
Revolutions per mile (km) 1001.31 (622.18) 886.89 (551.09) -114.42 (-71.09) -11.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)22.58 mph (36.34 km/h)
25 mph (40.23 km/h)28.23 mph (45.42 km/h)
30 mph (48.28 km/h)33.87 mph (54.51 km/h)
35 mph (56.33 km/h)39.52 mph (63.59 km/h)
40 mph (64.37 km/h)45.16 mph (72.68 km/h)
45 mph (72.42 km/h)50.81 mph (81.76 km/h)
50 mph (80.47 km/h)56.45 mph (90.85 km/h)
55 mph (88.51 km/h)62.1 mph (99.93 km/h)
60 mph (96.56 km/h)67.74 mph (109.02 km/h)
65 mph (104.61 km/h)73.39 mph (118.1 km/h)
70 mph (112.65 km/h)79.03 mph (127.19 km/h)
75 mph (120.7 km/h)84.68 mph (136.27 km/h)
80 mph (128.75 km/h)90.32 mph (145.36 km/h)
85 mph (136.79 km/h)95.97 mph (154.44 km/h)
90 mph (144.84 km/h)101.61 mph (163.53 km/h)
95 mph (152.89 km/h)107.26 mph (172.61 km/h)
100 mph (160.93 km/h)112.9 mph (181.7 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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