Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
305/45r20 vs 295/45r20 Tire Comparison Side By Side
  305/45-20 295/45-20 Difference
Diameter inches (mm) 30.81 (782.5) 30.45 (773.5) -0.35 (-9) -1.2%
Width inches (mm) 12.01 (305) 11.61 (295) -0.39 (-10) -3.3%
Circum. inches (mm) 96.78 (2458.3) 95.67 (2430.02) -1.11 (-28.27) -1.2%
Sidewall Height inches (mm) 5.4 (137.25) 5.23 (132.75) -0.18 (-4.5) -3.3%
Revolutions per mile (km) 654.66 (406.79) 662.28 (411.52) 7.62 (4.73) 1.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.77 mph (31.82 km/h)
25 mph (40.23 km/h)24.71 mph (39.77 km/h)
30 mph (48.28 km/h)29.65 mph (47.73 km/h)
35 mph (56.33 km/h)34.6 mph (55.68 km/h)
40 mph (64.37 km/h)39.54 mph (63.63 km/h)
45 mph (72.42 km/h)44.48 mph (71.59 km/h)
50 mph (80.47 km/h)49.42 mph (79.54 km/h)
55 mph (88.51 km/h)54.37 mph (87.5 km/h)
60 mph (96.56 km/h)59.31 mph (95.45 km/h)
65 mph (104.61 km/h)64.25 mph (103.4 km/h)
70 mph (112.65 km/h)69.19 mph (111.36 km/h)
75 mph (120.7 km/h)74.14 mph (119.31 km/h)
80 mph (128.75 km/h)79.08 mph (127.27 km/h)
85 mph (136.79 km/h)84.02 mph (135.22 km/h)
90 mph (144.84 km/h)88.96 mph (143.18 km/h)
95 mph (152.89 km/h)93.91 mph (151.13 km/h)
100 mph (160.93 km/h)98.85 mph (159.08 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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