Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
305/60r20 vs 295/60r20 Tire Comparison Side By Side
  305/60-20 295/60-20 Difference
Diameter inches (mm) 34.41 (874) 33.94 (862) -0.47 (-12) -1.4%
Width inches (mm) 12.01 (305) 11.61 (295) -0.39 (-10) -3.3%
Circum. inches (mm) 108.1 (2745.75) 106.62 (2708.05) -1.48 (-37.7) -1.4%
Sidewall Height inches (mm) 7.2 (183) 6.97 (177) -0.24 (-6) -3.3%
Revolutions per mile (km) 586.12 (364.2) 594.28 (369.27) 8.16 (5.07) 1.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.73 mph (31.75 km/h)
25 mph (40.23 km/h)24.66 mph (39.68 km/h)
30 mph (48.28 km/h)29.59 mph (47.62 km/h)
35 mph (56.33 km/h)34.52 mph (55.55 km/h)
40 mph (64.37 km/h)39.45 mph (63.49 km/h)
45 mph (72.42 km/h)44.38 mph (71.43 km/h)
50 mph (80.47 km/h)49.31 mph (79.36 km/h)
55 mph (88.51 km/h)54.24 mph (87.3 km/h)
60 mph (96.56 km/h)59.18 mph (95.24 km/h)
65 mph (104.61 km/h)64.11 mph (103.17 km/h)
70 mph (112.65 km/h)69.04 mph (111.11 km/h)
75 mph (120.7 km/h)73.97 mph (119.04 km/h)
80 mph (128.75 km/h)78.9 mph (126.98 km/h)
85 mph (136.79 km/h)83.83 mph (134.92 km/h)
90 mph (144.84 km/h)88.76 mph (142.85 km/h)
95 mph (152.89 km/h)93.7 mph (150.79 km/h)
100 mph (160.93 km/h)98.63 mph (158.73 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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