Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
305/40r22 vs 305/50r20 Tire Comparison Side By Side
  305/40-22 305/50-20 Difference
Diameter inches (mm) 31.61 (802.8) 32.01 (813) 0.4 (10.2) 1.3%
Width inches (mm) 12.01 (305) 12.01 (305) 0 (0) 0%
Circum. inches (mm) 99.29 (2522.07) 100.56 (2554.11) 1.26 (32.04) 1.3%
Sidewall Height inches (mm) 4.8 (122) 6 (152.5) 1.2 (30.5) 25%
Revolutions per mile (km) 638.1 (396.5) 630.1 (391.52) -8.01 (-4.97) -1.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.25 mph (32.6 km/h)
25 mph (40.23 km/h)25.32 mph (40.74 km/h)
30 mph (48.28 km/h)30.38 mph (48.89 km/h)
35 mph (56.33 km/h)35.44 mph (57.04 km/h)
40 mph (64.37 km/h)40.51 mph (65.19 km/h)
45 mph (72.42 km/h)45.57 mph (73.34 km/h)
50 mph (80.47 km/h)50.64 mph (81.49 km/h)
55 mph (88.51 km/h)55.7 mph (89.64 km/h)
60 mph (96.56 km/h)60.76 mph (97.79 km/h)
65 mph (104.61 km/h)65.83 mph (105.94 km/h)
70 mph (112.65 km/h)70.89 mph (114.09 km/h)
75 mph (120.7 km/h)75.95 mph (122.23 km/h)
80 mph (128.75 km/h)81.02 mph (130.38 km/h)
85 mph (136.79 km/h)86.08 mph (138.53 km/h)
90 mph (144.84 km/h)91.14 mph (146.68 km/h)
95 mph (152.89 km/h)96.21 mph (154.83 km/h)
100 mph (160.93 km/h)101.27 mph (162.98 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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