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 245/75r16 Tire Comparison Side By Side
  305/40-23 245/75-16 Difference
Diameter inches (mm) 32.61 (828.2) 30.47 (773.9) -2.14 (-54.3) -6.6%
Width inches (mm) 12.01 (305) 9.65 (245) -2.36 (-60) -19.7%
Circum. inches (mm) 102.44 (2601.87) 95.72 (2431.28) -6.72 (-170.59) -6.6%
Sidewall Height inches (mm) 4.8 (122) 7.23 (183.75) 2.43 (61.75) 50.6%
Revolutions per mile (km) 618.53 (384.34) 661.93 (411.31) 43.4 (26.97) 7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.69 mph (30.08 km/h)
25 mph (40.23 km/h)23.36 mph (37.6 km/h)
30 mph (48.28 km/h)28.03 mph (45.11 km/h)
35 mph (56.33 km/h)32.71 mph (52.63 km/h)
40 mph (64.37 km/h)37.38 mph (60.15 km/h)
45 mph (72.42 km/h)42.05 mph (67.67 km/h)
50 mph (80.47 km/h)46.72 mph (75.19 km/h)
55 mph (88.51 km/h)51.39 mph (82.71 km/h)
60 mph (96.56 km/h)56.07 mph (90.23 km/h)
65 mph (104.61 km/h)60.74 mph (97.75 km/h)
70 mph (112.65 km/h)65.41 mph (105.27 km/h)
75 mph (120.7 km/h)70.08 mph (112.79 km/h)
80 mph (128.75 km/h)74.75 mph (120.31 km/h)
85 mph (136.79 km/h)79.43 mph (127.83 km/h)
90 mph (144.84 km/h)84.1 mph (135.34 km/h)
95 mph (152.89 km/h)88.77 mph (142.86 km/h)
100 mph (160.93 km/h)93.44 mph (150.38 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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