Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
265/65r20 vs 35/12.5r20 Tire Comparison Side By Side
  265/65-20 35/12.5-20 Difference
Diameter inches (mm) 33.56 (852.5) 35.02 (889.6) 1.46 (37.1) 4.4%
Width inches (mm) 10.43 (265) 12.52 (318) 2.09 (53) 20%
Circum. inches (mm) 105.44 (2678.21) 110.03 (2794.76) 4.59 (116.55) 4.4%
Sidewall Height inches (mm) 6.78 (172.25) 7.51 (190.8) 0.73 (18.55) 10.8%
Revolutions per mile (km) 600.9 (373.38) 575.84 (357.81) -25.06 (-15.57) -4.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.87 mph (33.59 km/h)
25 mph (40.23 km/h)26.09 mph (41.98 km/h)
30 mph (48.28 km/h)31.31 mph (50.38 km/h)
35 mph (56.33 km/h)36.52 mph (58.78 km/h)
40 mph (64.37 km/h)41.74 mph (67.18 km/h)
45 mph (72.42 km/h)46.96 mph (75.57 km/h)
50 mph (80.47 km/h)52.18 mph (83.97 km/h)
55 mph (88.51 km/h)57.39 mph (92.37 km/h)
60 mph (96.56 km/h)62.61 mph (100.76 km/h)
65 mph (104.61 km/h)67.83 mph (109.16 km/h)
70 mph (112.65 km/h)73.05 mph (117.56 km/h)
75 mph (120.7 km/h)78.26 mph (125.95 km/h)
80 mph (128.75 km/h)83.48 mph (134.35 km/h)
85 mph (136.79 km/h)88.7 mph (142.75 km/h)
90 mph (144.84 km/h)93.92 mph (151.14 km/h)
95 mph (152.89 km/h)99.13 mph (159.54 km/h)
100 mph (160.93 km/h)104.35 mph (167.94 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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