Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
305/35r23 vs 285/40r23 Tire Comparison Side By Side
  305/35-23 285/40-23 Difference
Diameter inches (mm) 31.41 (797.7) 31.98 (812.2) 0.57 (14.5) 1.8%
Width inches (mm) 12.01 (305) 11.22 (285) -0.79 (-20) -6.6%
Circum. inches (mm) 98.66 (2506.05) 100.46 (2551.6) 1.79 (45.55) 1.8%
Sidewall Height inches (mm) 4.2 (106.75) 4.49 (114) 0.29 (7.25) 6.8%
Revolutions per mile (km) 642.18 (399.03) 630.72 (391.91) -11.46 (-7.12) -1.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.36 mph (32.77 km/h)
25 mph (40.23 km/h)25.45 mph (40.97 km/h)
30 mph (48.28 km/h)30.55 mph (49.16 km/h)
35 mph (56.33 km/h)35.64 mph (57.35 km/h)
40 mph (64.37 km/h)40.73 mph (65.54 km/h)
45 mph (72.42 km/h)45.82 mph (73.74 km/h)
50 mph (80.47 km/h)50.91 mph (81.93 km/h)
55 mph (88.51 km/h)56 mph (90.12 km/h)
60 mph (96.56 km/h)61.09 mph (98.32 km/h)
65 mph (104.61 km/h)66.18 mph (106.51 km/h)
70 mph (112.65 km/h)71.27 mph (114.7 km/h)
75 mph (120.7 km/h)76.36 mph (122.9 km/h)
80 mph (128.75 km/h)81.45 mph (131.09 km/h)
85 mph (136.79 km/h)86.55 mph (139.28 km/h)
90 mph (144.84 km/h)91.64 mph (147.47 km/h)
95 mph (152.89 km/h)96.73 mph (155.67 km/h)
100 mph (160.93 km/h)101.82 mph (163.86 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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