Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
245/35r16 vs 245/20r18 Tire Comparison Side By Side
  245/35-16 245/20-18 Difference
Diameter inches (mm) 22.75 (577.9) 21.86 (555.2) -0.89 (-22.7) -3.9%
Width inches (mm) 9.65 (245) 9.65 (245) 0 (0) 0%
Circum. inches (mm) 71.48 (1815.53) 68.67 (1744.21) -2.81 (-71.31) -3.9%
Sidewall Height inches (mm) 3.38 (85.75) 1.93 (49) -1.45 (-36.75) -42.9%
Revolutions per mile (km) 886.43 (550.8) 922.68 (573.32) 36.24 (22.52) 4.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.21 mph (30.92 km/h)
25 mph (40.23 km/h)24.02 mph (38.65 km/h)
30 mph (48.28 km/h)28.82 mph (46.38 km/h)
35 mph (56.33 km/h)33.63 mph (54.11 km/h)
40 mph (64.37 km/h)38.43 mph (61.85 km/h)
45 mph (72.42 km/h)43.23 mph (69.58 km/h)
50 mph (80.47 km/h)48.04 mph (77.31 km/h)
55 mph (88.51 km/h)52.84 mph (85.04 km/h)
60 mph (96.56 km/h)57.64 mph (92.77 km/h)
65 mph (104.61 km/h)62.45 mph (100.5 km/h)
70 mph (112.65 km/h)67.25 mph (108.23 km/h)
75 mph (120.7 km/h)72.05 mph (115.96 km/h)
80 mph (128.75 km/h)76.86 mph (123.69 km/h)
85 mph (136.79 km/h)81.66 mph (131.42 km/h)
90 mph (144.84 km/h)86.46 mph (139.15 km/h)
95 mph (152.89 km/h)91.27 mph (146.88 km/h)
100 mph (160.93 km/h)96.07 mph (154.61 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
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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