Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
355/25r21 vs 350/45r22 Tire Comparison Side By Side
  355/25-21 350/45-22 Difference
Diameter inches (mm) 27.99 (710.9) 34.4 (873.8) 6.41 (162.9) 22.9%
Width inches (mm) 13.98 (355) 13.78 (350) -0.2 (-5) -1.4%
Circum. inches (mm) 87.93 (2233.36) 108.08 (2745.12) 20.15 (511.77) 22.9%
Sidewall Height inches (mm) 3.49 (88.75) 6.2 (157.5) 2.71 (68.75) 77.5%
Revolutions per mile (km) 720.59 (447.76) 586.26 (364.28) -134.34 (-83.47) -18.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)24.58 mph (39.56 km/h)
25 mph (40.23 km/h)30.73 mph (49.45 km/h)
30 mph (48.28 km/h)36.87 mph (59.34 km/h)
35 mph (56.33 km/h)43.02 mph (69.23 km/h)
40 mph (64.37 km/h)49.17 mph (79.12 km/h)
45 mph (72.42 km/h)55.31 mph (89.02 km/h)
50 mph (80.47 km/h)61.46 mph (98.91 km/h)
55 mph (88.51 km/h)67.6 mph (108.8 km/h)
60 mph (96.56 km/h)73.75 mph (118.69 km/h)
65 mph (104.61 km/h)79.89 mph (128.58 km/h)
70 mph (112.65 km/h)86.04 mph (138.47 km/h)
75 mph (120.7 km/h)92.19 mph (148.36 km/h)
80 mph (128.75 km/h)98.33 mph (158.25 km/h)
85 mph (136.79 km/h)104.48 mph (168.14 km/h)
90 mph (144.84 km/h)110.62 mph (178.03 km/h)
95 mph (152.89 km/h)116.77 mph (187.92 km/h)
100 mph (160.93 km/h)122.91 mph (197.81 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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