Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
165/82r15 vs 225/30r20 Tire Comparison Side By Side
  165/82-15 225/30-20 Difference
Diameter inches (mm) 25.65 (651.6) 25.31 (643) -0.34 (-8.6) -1.3%
Width inches (mm) 6.5 (165) 8.86 (225) 2.36 (60) 36.4%
Circum. inches (mm) 80.59 (2047.06) 79.53 (2020.04) -1.06 (-27.02) -1.3%
Sidewall Height inches (mm) 5.33 (135.3) 2.66 (67.5) -2.67 (-67.8) -50.1%
Revolutions per mile (km) 786.17 (488.5) 796.69 (495.04) 10.51 (6.53) 1.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.74 mph (31.76 km/h)
25 mph (40.23 km/h)24.67 mph (39.7 km/h)
30 mph (48.28 km/h)29.6 mph (47.64 km/h)
35 mph (56.33 km/h)34.54 mph (55.58 km/h)
40 mph (64.37 km/h)39.47 mph (63.52 km/h)
45 mph (72.42 km/h)44.41 mph (71.46 km/h)
50 mph (80.47 km/h)49.34 mph (79.41 km/h)
55 mph (88.51 km/h)54.27 mph (87.35 km/h)
60 mph (96.56 km/h)59.21 mph (95.29 km/h)
65 mph (104.61 km/h)64.14 mph (103.23 km/h)
70 mph (112.65 km/h)69.08 mph (111.17 km/h)
75 mph (120.7 km/h)74.01 mph (119.11 km/h)
80 mph (128.75 km/h)78.94 mph (127.05 km/h)
85 mph (136.79 km/h)83.88 mph (134.99 km/h)
90 mph (144.84 km/h)88.81 mph (142.93 km/h)
95 mph (152.89 km/h)93.75 mph (150.87 km/h)
100 mph (160.93 km/h)98.68 mph (158.81 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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