Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
285/70r18 vs 35/12.5r18 Tire Comparison Side By Side
  285/70-18 35/12.5-18 Difference
Diameter inches (mm) 33.71 (856.2) 35.03 (889.68) 1.32 (33.48) 3.9%
Width inches (mm) 11.22 (285) 12.52 (318) 1.3 (33) 11.6%
Circum. inches (mm) 105.9 (2689.83) 110.04 (2795.01) 4.14 (105.18) 3.9%
Sidewall Height inches (mm) 7.85 (199.5) 8.51 (216.24) 0.66 (16.74) 8.4%
Revolutions per mile (km) 598.31 (371.77) 575.79 (357.78) -22.52 (-13.99) -3.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.78 mph (33.45 km/h)
25 mph (40.23 km/h)25.98 mph (41.81 km/h)
30 mph (48.28 km/h)31.17 mph (50.17 km/h)
35 mph (56.33 km/h)36.37 mph (58.53 km/h)
40 mph (64.37 km/h)41.56 mph (66.89 km/h)
45 mph (72.42 km/h)46.76 mph (75.25 km/h)
50 mph (80.47 km/h)51.96 mph (83.61 km/h)
55 mph (88.51 km/h)57.15 mph (91.98 km/h)
60 mph (96.56 km/h)62.35 mph (100.34 km/h)
65 mph (104.61 km/h)67.54 mph (108.7 km/h)
70 mph (112.65 km/h)72.74 mph (117.06 km/h)
75 mph (120.7 km/h)77.93 mph (125.42 km/h)
80 mph (128.75 km/h)83.13 mph (133.78 km/h)
85 mph (136.79 km/h)88.32 mph (142.14 km/h)
90 mph (144.84 km/h)93.52 mph (150.5 km/h)
95 mph (152.89 km/h)98.71 mph (158.87 km/h)
100 mph (160.93 km/h)103.91 mph (167.23 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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