Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
305/35r22 vs 305/40r22 Tire Comparison Side By Side
  305/35-22 305/40-22 Difference
Diameter inches (mm) 30.41 (772.3) 31.61 (802.8) 1.2 (30.5) 3.9%
Width inches (mm) 12.01 (305) 12.01 (305) 0 (0) 0%
Circum. inches (mm) 95.52 (2426.25) 99.29 (2522.07) 3.77 (95.82) 3.9%
Sidewall Height inches (mm) 4.2 (106.75) 4.8 (122) 0.6 (15.25) 14.3%
Revolutions per mile (km) 663.3 (412.16) 638.1 (396.5) -25.2 (-15.66) -3.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.79 mph (33.46 km/h)
25 mph (40.23 km/h)25.99 mph (41.82 km/h)
30 mph (48.28 km/h)31.18 mph (50.19 km/h)
35 mph (56.33 km/h)36.38 mph (58.55 km/h)
40 mph (64.37 km/h)41.58 mph (66.92 km/h)
45 mph (72.42 km/h)46.78 mph (75.28 km/h)
50 mph (80.47 km/h)51.97 mph (83.65 km/h)
55 mph (88.51 km/h)57.17 mph (92.01 km/h)
60 mph (96.56 km/h)62.37 mph (100.37 km/h)
65 mph (104.61 km/h)67.57 mph (108.74 km/h)
70 mph (112.65 km/h)72.76 mph (117.1 km/h)
75 mph (120.7 km/h)77.96 mph (125.47 km/h)
80 mph (128.75 km/h)83.16 mph (133.83 km/h)
85 mph (136.79 km/h)88.36 mph (142.2 km/h)
90 mph (144.84 km/h)93.55 mph (150.56 km/h)
95 mph (152.89 km/h)98.75 mph (158.93 km/h)
100 mph (160.93 km/h)103.95 mph (167.29 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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