Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
305/25r20 vs 295/30r20 Tire Comparison Side By Side
  305/25-20 295/30-20 Difference
Diameter inches (mm) 26 (660.5) 26.97 (685) 0.96 (24.5) 3.7%
Width inches (mm) 12.01 (305) 11.61 (295) -0.39 (-10) -3.3%
Circum. inches (mm) 81.69 (2075.02) 84.72 (2151.99) 3.03 (76.97) 3.7%
Sidewall Height inches (mm) 3 (76.25) 3.48 (88.5) 0.48 (12.25) 16.1%
Revolutions per mile (km) 775.58 (481.92) 747.84 (464.69) -27.74 (-17.24) -3.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.74 mph (33.38 km/h)
25 mph (40.23 km/h)25.93 mph (41.73 km/h)
30 mph (48.28 km/h)31.11 mph (50.07 km/h)
35 mph (56.33 km/h)36.3 mph (58.42 km/h)
40 mph (64.37 km/h)41.48 mph (66.76 km/h)
45 mph (72.42 km/h)46.67 mph (75.11 km/h)
50 mph (80.47 km/h)51.85 mph (83.45 km/h)
55 mph (88.51 km/h)57.04 mph (91.8 km/h)
60 mph (96.56 km/h)62.23 mph (100.14 km/h)
65 mph (104.61 km/h)67.41 mph (108.49 km/h)
70 mph (112.65 km/h)72.6 mph (116.83 km/h)
75 mph (120.7 km/h)77.78 mph (125.18 km/h)
80 mph (128.75 km/h)82.97 mph (133.52 km/h)
85 mph (136.79 km/h)88.15 mph (141.87 km/h)
90 mph (144.84 km/h)93.34 mph (150.21 km/h)
95 mph (152.89 km/h)98.52 mph (158.56 km/h)
100 mph (160.93 km/h)103.71 mph (166.9 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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