Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
190/60r15 vs 185/60r14 Tire Comparison Side By Side
  190/60-15 185/60-14 Difference
Diameter inches (mm) 23.98 (609) 22.74 (577.6) -1.24 (-31.4) -5.2%
Width inches (mm) 7.48 (190) 7.28 (185) -0.2 (-5) -2.6%
Circum. inches (mm) 75.32 (1913.23) 71.44 (1814.58) -3.88 (-98.65) -5.2%
Sidewall Height inches (mm) 4.49 (114) 4.37 (111) -0.12 (-3) -2.6%
Revolutions per mile (km) 841.17 (522.68) 886.89 (551.09) 45.73 (28.41) 5.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.97 mph (30.53 km/h)
25 mph (40.23 km/h)23.71 mph (38.16 km/h)
30 mph (48.28 km/h)28.45 mph (45.79 km/h)
35 mph (56.33 km/h)33.2 mph (53.42 km/h)
40 mph (64.37 km/h)37.94 mph (61.05 km/h)
45 mph (72.42 km/h)42.68 mph (68.69 km/h)
50 mph (80.47 km/h)47.42 mph (76.32 km/h)
55 mph (88.51 km/h)52.16 mph (83.95 km/h)
60 mph (96.56 km/h)56.91 mph (91.58 km/h)
65 mph (104.61 km/h)61.65 mph (99.21 km/h)
70 mph (112.65 km/h)66.39 mph (106.85 km/h)
75 mph (120.7 km/h)71.13 mph (114.48 km/h)
80 mph (128.75 km/h)75.88 mph (122.11 km/h)
85 mph (136.79 km/h)80.62 mph (129.74 km/h)
90 mph (144.84 km/h)85.36 mph (137.37 km/h)
95 mph (152.89 km/h)90.1 mph (145.01 km/h)
100 mph (160.93 km/h)94.84 mph (152.64 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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