Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
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285/65r18 vs 295/70r18 Tire Comparison Side By Side
  285/65-18 295/70-18 Difference
Diameter inches (mm) 32.59 (827.7) 34.26 (870.2) 1.67 (42.5) 5.1%
Width inches (mm) 11.22 (285) 11.61 (295) 0.39 (10) 3.5%
Circum. inches (mm) 102.37 (2600.3) 107.63 (2733.81) 5.26 (133.52) 5.1%
Sidewall Height inches (mm) 7.29 (185.25) 8.13 (206.5) 0.84 (21.25) 11.5%
Revolutions per mile (km) 618.91 (384.57) 588.68 (365.79) -30.23 (-18.78) -4.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.03 mph (33.84 km/h)
25 mph (40.23 km/h)26.28 mph (42.3 km/h)
30 mph (48.28 km/h)31.54 mph (50.76 km/h)
35 mph (56.33 km/h)36.8 mph (59.22 km/h)
40 mph (64.37 km/h)42.05 mph (67.68 km/h)
45 mph (72.42 km/h)47.31 mph (76.14 km/h)
50 mph (80.47 km/h)52.57 mph (84.6 km/h)
55 mph (88.51 km/h)57.82 mph (93.06 km/h)
60 mph (96.56 km/h)63.08 mph (101.52 km/h)
65 mph (104.61 km/h)68.34 mph (109.98 km/h)
70 mph (112.65 km/h)73.59 mph (118.44 km/h)
75 mph (120.7 km/h)78.85 mph (126.9 km/h)
80 mph (128.75 km/h)84.11 mph (135.36 km/h)
85 mph (136.79 km/h)89.36 mph (143.82 km/h)
90 mph (144.84 km/h)94.62 mph (152.28 km/h)
95 mph (152.89 km/h)99.88 mph (160.74 km/h)
100 mph (160.93 km/h)105.13 mph (169.2 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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