Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
245/45r17 vs 225/45r16 Tire Comparison Side By Side
  245/45-17 225/45-16 Difference
Diameter inches (mm) 25.68 (652.3) 23.97 (608.9) -1.71 (-43.4) -6.7%
Width inches (mm) 9.65 (245) 8.86 (225) -0.79 (-20) -8.2%
Circum. inches (mm) 80.68 (2049.26) 75.31 (1912.92) -5.37 (-136.35) -6.7%
Sidewall Height inches (mm) 4.34 (110.25) 3.99 (101.25) -0.35 (-9) -8.2%
Revolutions per mile (km) 785.33 (487.98) 841.3 (522.76) 55.98 (34.78) 7.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.67 mph (30.05 km/h)
25 mph (40.23 km/h)23.34 mph (37.56 km/h)
30 mph (48.28 km/h)28 mph (45.07 km/h)
35 mph (56.33 km/h)32.67 mph (52.58 km/h)
40 mph (64.37 km/h)37.34 mph (60.09 km/h)
45 mph (72.42 km/h)42.01 mph (67.6 km/h)
50 mph (80.47 km/h)46.67 mph (75.11 km/h)
55 mph (88.51 km/h)51.34 mph (82.62 km/h)
60 mph (96.56 km/h)56.01 mph (90.14 km/h)
65 mph (104.61 km/h)60.68 mph (97.65 km/h)
70 mph (112.65 km/h)65.34 mph (105.16 km/h)
75 mph (120.7 km/h)70.01 mph (112.67 km/h)
80 mph (128.75 km/h)74.68 mph (120.18 km/h)
85 mph (136.79 km/h)79.34 mph (127.69 km/h)
90 mph (144.84 km/h)84.01 mph (135.2 km/h)
95 mph (152.89 km/h)88.68 mph (142.72 km/h)
100 mph (160.93 km/h)93.35 mph (150.23 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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