Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
255/55r20 vs 265/60r20 Tire Comparison Side By Side
  255/55-20 265/60-20 Difference
Diameter inches (mm) 31.04 (788.5) 32.52 (826) 1.48 (37.5) 4.8%
Width inches (mm) 10.04 (255) 10.43 (265) 0.39 (10) 3.9%
Circum. inches (mm) 97.53 (2477.15) 102.16 (2594.96) 4.64 (117.81) 4.8%
Sidewall Height inches (mm) 5.52 (140.25) 6.26 (159) 0.74 (18.75) 13.4%
Revolutions per mile (km) 649.68 (403.69) 620.18 (385.36) -29.5 (-18.33) -4.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.95 mph (33.72 km/h)
25 mph (40.23 km/h)26.19 mph (42.15 km/h)
30 mph (48.28 km/h)31.43 mph (50.58 km/h)
35 mph (56.33 km/h)36.66 mph (59.01 km/h)
40 mph (64.37 km/h)41.9 mph (67.44 km/h)
45 mph (72.42 km/h)47.14 mph (75.86 km/h)
50 mph (80.47 km/h)52.38 mph (84.29 km/h)
55 mph (88.51 km/h)57.62 mph (92.72 km/h)
60 mph (96.56 km/h)62.85 mph (101.15 km/h)
65 mph (104.61 km/h)68.09 mph (109.58 km/h)
70 mph (112.65 km/h)73.33 mph (118.01 km/h)
75 mph (120.7 km/h)78.57 mph (126.44 km/h)
80 mph (128.75 km/h)83.8 mph (134.87 km/h)
85 mph (136.79 km/h)89.04 mph (143.3 km/h)
90 mph (144.84 km/h)94.28 mph (151.73 km/h)
95 mph (152.89 km/h)99.52 mph (160.16 km/h)
100 mph (160.93 km/h)104.76 mph (168.59 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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