Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
275/25r20 vs 275/30r20 Tire Comparison Side By Side
  275/25-20 275/30-20 Difference
Diameter inches (mm) 25.41 (645.5) 26.5 (673) 1.08 (27.5) 4.3%
Width inches (mm) 10.83 (275) 10.83 (275) 0 (0) 0%
Circum. inches (mm) 79.84 (2027.9) 83.24 (2114.29) 3.4 (86.39) 4.3%
Sidewall Height inches (mm) 2.71 (68.75) 3.25 (82.5) 0.54 (13.75) 20%
Revolutions per mile (km) 793.6 (493.12) 761.17 (472.97) -32.43 (-20.15) -4.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.85 mph (33.56 km/h)
25 mph (40.23 km/h)26.07 mph (41.95 km/h)
30 mph (48.28 km/h)31.28 mph (50.34 km/h)
35 mph (56.33 km/h)36.49 mph (58.73 km/h)
40 mph (64.37 km/h)41.7 mph (67.12 km/h)
45 mph (72.42 km/h)46.92 mph (75.51 km/h)
50 mph (80.47 km/h)52.13 mph (83.9 km/h)
55 mph (88.51 km/h)57.34 mph (92.29 km/h)
60 mph (96.56 km/h)62.56 mph (100.67 km/h)
65 mph (104.61 km/h)67.77 mph (109.06 km/h)
70 mph (112.65 km/h)72.98 mph (117.45 km/h)
75 mph (120.7 km/h)78.2 mph (125.84 km/h)
80 mph (128.75 km/h)83.41 mph (134.23 km/h)
85 mph (136.79 km/h)88.62 mph (142.62 km/h)
90 mph (144.84 km/h)93.83 mph (151.01 km/h)
95 mph (152.89 km/h)99.05 mph (159.4 km/h)
100 mph (160.93 km/h)104.26 mph (167.79 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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