Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
225/35r18 vs 235/40r18 Tire Comparison Side By Side
  225/35-18 235/40-18 Difference
Diameter inches (mm) 24.2 (614.7) 25.4 (645.2) 1.2 (30.5) 5%
Width inches (mm) 8.86 (225) 9.25 (235) 0.39 (10) 4.4%
Circum. inches (mm) 76.03 (1931.14) 79.8 (2026.96) 3.77 (95.82) 5%
Sidewall Height inches (mm) 3.1 (78.75) 3.7 (94) 0.6 (15.25) 19.4%
Revolutions per mile (km) 833.37 (517.83) 793.97 (493.35) -39.4 (-24.48) -4.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.99 mph (33.78 km/h)
25 mph (40.23 km/h)26.24 mph (42.23 km/h)
30 mph (48.28 km/h)31.49 mph (50.68 km/h)
35 mph (56.33 km/h)36.74 mph (59.12 km/h)
40 mph (64.37 km/h)41.98 mph (67.57 km/h)
45 mph (72.42 km/h)47.23 mph (76.01 km/h)
50 mph (80.47 km/h)52.48 mph (84.46 km/h)
55 mph (88.51 km/h)57.73 mph (92.91 km/h)
60 mph (96.56 km/h)62.98 mph (101.35 km/h)
65 mph (104.61 km/h)68.23 mph (109.8 km/h)
70 mph (112.65 km/h)73.47 mph (118.24 km/h)
75 mph (120.7 km/h)78.72 mph (126.69 km/h)
80 mph (128.75 km/h)83.97 mph (135.14 km/h)
85 mph (136.79 km/h)89.22 mph (143.58 km/h)
90 mph (144.84 km/h)94.47 mph (152.03 km/h)
95 mph (152.89 km/h)99.71 mph (160.47 km/h)
100 mph (160.93 km/h)104.96 mph (168.92 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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