Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
255/50r19 vs 290/50r20 Tire Comparison Side By Side
  255/50-19 290/50-20 Difference
Diameter inches (mm) 29.04 (737.6) 31.42 (798) 2.38 (60.4) 8.2%
Width inches (mm) 10.04 (255) 11.42 (290) 1.38 (35) 13.7%
Circum. inches (mm) 91.23 (2317.24) 98.7 (2506.99) 7.47 (189.75) 8.2%
Sidewall Height inches (mm) 5.02 (127.5) 5.71 (145) 0.69 (17.5) 13.7%
Revolutions per mile (km) 694.51 (431.55) 641.94 (398.88) -52.57 (-32.66) -7.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.64 mph (34.82 km/h)
25 mph (40.23 km/h)27.05 mph (43.53 km/h)
30 mph (48.28 km/h)32.46 mph (52.23 km/h)
35 mph (56.33 km/h)37.87 mph (60.94 km/h)
40 mph (64.37 km/h)43.28 mph (69.65 km/h)
45 mph (72.42 km/h)48.68 mph (78.35 km/h)
50 mph (80.47 km/h)54.09 mph (87.06 km/h)
55 mph (88.51 km/h)59.5 mph (95.76 km/h)
60 mph (96.56 km/h)64.91 mph (104.47 km/h)
65 mph (104.61 km/h)70.32 mph (113.17 km/h)
70 mph (112.65 km/h)75.73 mph (121.88 km/h)
75 mph (120.7 km/h)81.14 mph (130.58 km/h)
80 mph (128.75 km/h)86.55 mph (139.29 km/h)
85 mph (136.79 km/h)91.96 mph (148 km/h)
90 mph (144.84 km/h)97.37 mph (156.7 km/h)
95 mph (152.89 km/h)102.78 mph (165.41 km/h)
100 mph (160.93 km/h)108.19 mph (174.11 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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