Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
265/70r18 vs 275/65r20 Tire Comparison Side By Side
  265/70-18 275/65-20 Difference
Diameter inches (mm) 32.61 (828.2) 34.07 (865.5) 1.47 (37.3) 4.5%
Width inches (mm) 10.43 (265) 10.83 (275) 0.39 (10) 3.8%
Circum. inches (mm) 102.44 (2601.87) 107.05 (2719.05) 4.61 (117.18) 4.5%
Sidewall Height inches (mm) 7.3 (185.5) 7.04 (178.75) -0.27 (-6.75) -3.6%
Revolutions per mile (km) 618.53 (384.34) 591.88 (367.78) -26.66 (-16.56) -4.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.9 mph (33.64 km/h)
25 mph (40.23 km/h)26.13 mph (42.05 km/h)
30 mph (48.28 km/h)31.35 mph (50.45 km/h)
35 mph (56.33 km/h)36.58 mph (58.86 km/h)
40 mph (64.37 km/h)41.8 mph (67.27 km/h)
45 mph (72.42 km/h)47.03 mph (75.68 km/h)
50 mph (80.47 km/h)52.25 mph (84.09 km/h)
55 mph (88.51 km/h)57.48 mph (92.5 km/h)
60 mph (96.56 km/h)62.7 mph (100.91 km/h)
65 mph (104.61 km/h)67.93 mph (109.32 km/h)
70 mph (112.65 km/h)73.15 mph (117.73 km/h)
75 mph (120.7 km/h)78.38 mph (126.14 km/h)
80 mph (128.75 km/h)83.6 mph (134.55 km/h)
85 mph (136.79 km/h)88.83 mph (142.96 km/h)
90 mph (144.84 km/h)94.05 mph (151.36 km/h)
95 mph (152.89 km/h)99.28 mph (159.77 km/h)
100 mph (160.93 km/h)104.5 mph (168.18 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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