Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
245/70r19.5 vs 315/80r22.5 Tire Comparison Side By Side
  245/70-19.5 315/80-22.5 Difference
Diameter inches (mm) 33 (838.3) 42.34 (1075.5) 9.34 (237.2) 28.3%
Width inches (mm) 9.65 (245) 12.4 (315) 2.76 (70) 28.6%
Circum. inches (mm) 103.68 (2633.6) 133.02 (3378.78) 29.34 (745.19) 28.3%
Sidewall Height inches (mm) 6.75 (171.5) 9.92 (252) 3.17 (80.5) 46.9%
Revolutions per mile (km) 611.08 (379.71) 476.31 (295.96) -134.77 (-83.74) -22.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)25.66 mph (41.29 km/h)
25 mph (40.23 km/h)32.07 mph (51.62 km/h)
30 mph (48.28 km/h)38.49 mph (61.94 km/h)
35 mph (56.33 km/h)44.9 mph (72.27 km/h)
40 mph (64.37 km/h)51.32 mph (82.59 km/h)
45 mph (72.42 km/h)57.73 mph (92.91 km/h)
50 mph (80.47 km/h)64.15 mph (103.24 km/h)
55 mph (88.51 km/h)70.56 mph (113.56 km/h)
60 mph (96.56 km/h)76.98 mph (123.88 km/h)
65 mph (104.61 km/h)83.39 mph (134.21 km/h)
70 mph (112.65 km/h)89.81 mph (144.53 km/h)
75 mph (120.7 km/h)96.22 mph (154.85 km/h)
80 mph (128.75 km/h)102.64 mph (165.18 km/h)
85 mph (136.79 km/h)109.05 mph (175.5 km/h)
90 mph (144.84 km/h)115.47 mph (185.82 km/h)
95 mph (152.89 km/h)121.88 mph (196.15 km/h)
100 mph (160.93 km/h)128.3 mph (206.47 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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