Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
305/40r20 vs 305/40r22 Tire Comparison Side By Side
  305/40-20 305/40-22 Difference
Diameter inches (mm) 29.61 (752) 31.61 (802.8) 2 (50.8) 6.8%
Width inches (mm) 12.01 (305) 12.01 (305) 0 (0) 0%
Circum. inches (mm) 93.01 (2362.48) 99.29 (2522.07) 6.28 (159.59) 6.8%
Sidewall Height inches (mm) 4.8 (122) 4.8 (122) 0 (0) 0%
Revolutions per mile (km) 681.21 (423.28) 638.1 (396.5) -43.11 (-26.78) -6.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.35 mph (34.36 km/h)
25 mph (40.23 km/h)26.69 mph (42.95 km/h)
30 mph (48.28 km/h)32.03 mph (51.54 km/h)
35 mph (56.33 km/h)37.36 mph (60.13 km/h)
40 mph (64.37 km/h)42.7 mph (68.72 km/h)
45 mph (72.42 km/h)48.04 mph (77.31 km/h)
50 mph (80.47 km/h)53.38 mph (85.9 km/h)
55 mph (88.51 km/h)58.72 mph (94.49 km/h)
60 mph (96.56 km/h)64.05 mph (103.08 km/h)
65 mph (104.61 km/h)69.39 mph (111.67 km/h)
70 mph (112.65 km/h)74.73 mph (120.26 km/h)
75 mph (120.7 km/h)80.07 mph (128.85 km/h)
80 mph (128.75 km/h)85.4 mph (137.45 km/h)
85 mph (136.79 km/h)90.74 mph (146.04 km/h)
90 mph (144.84 km/h)96.08 mph (154.63 km/h)
95 mph (152.89 km/h)101.42 mph (163.22 km/h)
100 mph (160.93 km/h)106.76 mph (171.81 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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