Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
195/60r13 vs 225/60r15 Tire Comparison Side By Side
  195/60-13 225/60-15 Difference
Diameter inches (mm) 22.21 (564.2) 25.63 (651) 3.42 (86.8) 15.4%
Width inches (mm) 7.68 (195) 8.86 (225) 1.18 (30) 15.4%
Circum. inches (mm) 69.78 (1772.49) 80.52 (2045.18) 10.74 (272.69) 15.4%
Sidewall Height inches (mm) 4.61 (117) 5.31 (135) 0.71 (18) 15.4%
Revolutions per mile (km) 907.96 (564.18) 786.9 (488.95) -121.06 (-75.22) -13.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)23.08 mph (37.14 km/h)
25 mph (40.23 km/h)28.85 mph (46.42 km/h)
30 mph (48.28 km/h)34.62 mph (55.71 km/h)
35 mph (56.33 km/h)40.38 mph (64.99 km/h)
40 mph (64.37 km/h)46.15 mph (74.28 km/h)
45 mph (72.42 km/h)51.92 mph (83.56 km/h)
50 mph (80.47 km/h)57.69 mph (92.85 km/h)
55 mph (88.51 km/h)63.46 mph (102.13 km/h)
60 mph (96.56 km/h)69.23 mph (111.42 km/h)
65 mph (104.61 km/h)75 mph (120.7 km/h)
70 mph (112.65 km/h)80.77 mph (129.99 km/h)
75 mph (120.7 km/h)86.54 mph (139.27 km/h)
80 mph (128.75 km/h)92.31 mph (148.56 km/h)
85 mph (136.79 km/h)98.08 mph (157.84 km/h)
90 mph (144.84 km/h)103.85 mph (167.12 km/h)
95 mph (152.89 km/h)109.62 mph (176.41 km/h)
100 mph (160.93 km/h)115.38 mph (185.69 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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