Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
305/40r23 vs 235/55r23 Tire Comparison Side By Side
  305/40-23 235/55-23 Difference
Diameter inches (mm) 32.61 (828.2) 33.18 (842.7) 0.57 (14.5) 1.8%
Width inches (mm) 12.01 (305) 9.25 (235) -2.76 (-70) -23%
Circum. inches (mm) 102.44 (2601.87) 104.23 (2647.42) 1.79 (45.55) 1.8%
Sidewall Height inches (mm) 4.8 (122) 5.09 (129.25) 0.29 (7.25) 5.9%
Revolutions per mile (km) 618.53 (384.34) 607.89 (377.73) -10.64 (-6.61) -1.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.35 mph (32.75 km/h)
25 mph (40.23 km/h)25.44 mph (40.94 km/h)
30 mph (48.28 km/h)30.53 mph (49.13 km/h)
35 mph (56.33 km/h)35.61 mph (57.31 km/h)
40 mph (64.37 km/h)40.7 mph (65.5 km/h)
45 mph (72.42 km/h)45.79 mph (73.69 km/h)
50 mph (80.47 km/h)50.88 mph (81.88 km/h)
55 mph (88.51 km/h)55.96 mph (90.06 km/h)
60 mph (96.56 km/h)61.05 mph (98.25 km/h)
65 mph (104.61 km/h)66.14 mph (106.44 km/h)
70 mph (112.65 km/h)71.23 mph (114.63 km/h)
75 mph (120.7 km/h)76.31 mph (122.81 km/h)
80 mph (128.75 km/h)81.4 mph (131 km/h)
85 mph (136.79 km/h)86.49 mph (139.19 km/h)
90 mph (144.84 km/h)91.58 mph (147.38 km/h)
95 mph (152.89 km/h)96.66 mph (155.56 km/h)
100 mph (160.93 km/h)101.75 mph (163.75 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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