Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
265/75r18 vs 35/12.5r18 Tire Comparison Side By Side
  265/75-18 35/12.5-18 Difference
Diameter inches (mm) 33.65 (854.7) 35.03 (889.68) 1.38 (34.98) 4.1%
Width inches (mm) 10.43 (265) 12.52 (318) 2.09 (53) 20%
Circum. inches (mm) 105.71 (2685.12) 110.04 (2795.01) 4.33 (109.89) 4.1%
Sidewall Height inches (mm) 7.82 (198.75) 8.51 (216.24) 0.69 (17.49) 8.8%
Revolutions per mile (km) 599.36 (372.42) 575.79 (357.78) -23.57 (-14.64) -3.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.82 mph (33.5 km/h)
25 mph (40.23 km/h)26.02 mph (41.88 km/h)
30 mph (48.28 km/h)31.23 mph (50.26 km/h)
35 mph (56.33 km/h)36.43 mph (58.63 km/h)
40 mph (64.37 km/h)41.64 mph (67.01 km/h)
45 mph (72.42 km/h)46.84 mph (75.38 km/h)
50 mph (80.47 km/h)52.05 mph (83.76 km/h)
55 mph (88.51 km/h)57.25 mph (92.14 km/h)
60 mph (96.56 km/h)62.46 mph (100.51 km/h)
65 mph (104.61 km/h)67.66 mph (108.89 km/h)
70 mph (112.65 km/h)72.86 mph (117.26 km/h)
75 mph (120.7 km/h)78.07 mph (125.64 km/h)
80 mph (128.75 km/h)83.27 mph (134.02 km/h)
85 mph (136.79 km/h)88.48 mph (142.39 km/h)
90 mph (144.84 km/h)93.68 mph (150.77 km/h)
95 mph (152.89 km/h)98.89 mph (159.15 km/h)
100 mph (160.93 km/h)104.09 mph (167.52 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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