Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
185/85r14 vs 195/60r15 Tire Comparison Side By Side
  185/85-14 195/60-15 Difference
Diameter inches (mm) 26.38 (670.1) 24.21 (615) -2.17 (-55.1) -8.2%
Width inches (mm) 7.28 (185) 7.68 (195) 0.39 (10) 5.4%
Circum. inches (mm) 82.88 (2105.18) 76.07 (1932.08) -6.82 (-173.1) -8.2%
Sidewall Height inches (mm) 6.19 (157.25) 4.61 (117) -1.58 (-40.25) -25.6%
Revolutions per mile (km) 764.47 (475.02) 832.96 (517.58) 68.49 (42.56) 9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.36 mph (29.54 km/h)
25 mph (40.23 km/h)22.94 mph (36.93 km/h)
30 mph (48.28 km/h)27.53 mph (44.31 km/h)
35 mph (56.33 km/h)32.12 mph (51.7 km/h)
40 mph (64.37 km/h)36.71 mph (59.08 km/h)
45 mph (72.42 km/h)41.3 mph (66.47 km/h)
50 mph (80.47 km/h)45.89 mph (73.85 km/h)
55 mph (88.51 km/h)50.48 mph (81.24 km/h)
60 mph (96.56 km/h)55.07 mph (88.62 km/h)
65 mph (104.61 km/h)59.66 mph (96.01 km/h)
70 mph (112.65 km/h)64.24 mph (103.39 km/h)
75 mph (120.7 km/h)68.83 mph (110.78 km/h)
80 mph (128.75 km/h)73.42 mph (118.16 km/h)
85 mph (136.79 km/h)78.01 mph (125.55 km/h)
90 mph (144.84 km/h)82.6 mph (132.93 km/h)
95 mph (152.89 km/h)87.19 mph (140.32 km/h)
100 mph (160.93 km/h)91.78 mph (147.7 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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