Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
165/40r16 vs 185/35r17 Tire Comparison Side By Side
  165/40-16 185/35-17 Difference
Diameter inches (mm) 21.2 (538.4) 22.1 (561.3) 0.9 (22.9) 4.3%
Width inches (mm) 6.5 (165) 7.28 (185) 0.79 (20) 12.1%
Circum. inches (mm) 66.59 (1691.43) 69.42 (1763.38) 2.83 (71.94) 4.3%
Sidewall Height inches (mm) 2.6 (66) 2.55 (64.75) -0.05 (-1.25) -1.9%
Revolutions per mile (km) 951.47 (591.21) 912.65 (567.09) -38.82 (-24.12) -4.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.85 mph (33.56 km/h)
25 mph (40.23 km/h)26.06 mph (41.94 km/h)
30 mph (48.28 km/h)31.28 mph (50.33 km/h)
35 mph (56.33 km/h)36.49 mph (58.72 km/h)
40 mph (64.37 km/h)41.7 mph (67.11 km/h)
45 mph (72.42 km/h)46.91 mph (75.5 km/h)
50 mph (80.47 km/h)52.13 mph (83.89 km/h)
55 mph (88.51 km/h)57.34 mph (92.28 km/h)
60 mph (96.56 km/h)62.55 mph (100.67 km/h)
65 mph (104.61 km/h)67.76 mph (109.06 km/h)
70 mph (112.65 km/h)72.98 mph (117.45 km/h)
75 mph (120.7 km/h)78.19 mph (125.83 km/h)
80 mph (128.75 km/h)83.4 mph (134.22 km/h)
85 mph (136.79 km/h)88.62 mph (142.61 km/h)
90 mph (144.84 km/h)93.83 mph (151 km/h)
95 mph (152.89 km/h)99.04 mph (159.39 km/h)
100 mph (160.93 km/h)104.25 mph (167.78 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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