Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
235/45r22 vs 235/50r20 Tire Comparison Side By Side
  235/45-22 235/50-20 Difference
Diameter inches (mm) 30.33 (770.3) 29.25 (743) -1.07 (-27.3) -3.5%
Width inches (mm) 9.25 (235) 9.25 (235) 0 (0) 0%
Circum. inches (mm) 95.27 (2419.97) 91.9 (2334.2) -3.38 (-85.77) -3.5%
Sidewall Height inches (mm) 4.16 (105.75) 4.63 (117.5) 0.46 (11.75) 11.1%
Revolutions per mile (km) 665.03 (413.23) 689.46 (428.41) 24.44 (15.18) 3.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.29 mph (31.05 km/h)
25 mph (40.23 km/h)24.11 mph (38.81 km/h)
30 mph (48.28 km/h)28.94 mph (46.57 km/h)
35 mph (56.33 km/h)33.76 mph (54.33 km/h)
40 mph (64.37 km/h)38.58 mph (62.09 km/h)
45 mph (72.42 km/h)43.41 mph (69.85 km/h)
50 mph (80.47 km/h)48.23 mph (77.62 km/h)
55 mph (88.51 km/h)53.05 mph (85.38 km/h)
60 mph (96.56 km/h)57.87 mph (93.14 km/h)
65 mph (104.61 km/h)62.7 mph (100.9 km/h)
70 mph (112.65 km/h)67.52 mph (108.66 km/h)
75 mph (120.7 km/h)72.34 mph (116.42 km/h)
80 mph (128.75 km/h)77.16 mph (124.18 km/h)
85 mph (136.79 km/h)81.99 mph (131.95 km/h)
90 mph (144.84 km/h)86.81 mph (139.71 km/h)
95 mph (152.89 km/h)91.63 mph (147.47 km/h)
100 mph (160.93 km/h)96.46 mph (155.23 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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