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 285/40r22 Tire Comparison Side By Side
  305/40-23 285/40-22 Difference
Diameter inches (mm) 32.61 (828.2) 30.98 (786.8) -1.63 (-41.4) -5%
Width inches (mm) 12.01 (305) 11.22 (285) -0.79 (-20) -6.6%
Circum. inches (mm) 102.44 (2601.87) 97.32 (2471.81) -5.12 (-130.06) -5%
Sidewall Height inches (mm) 4.8 (122) 4.49 (114) -0.31 (-8) -6.6%
Revolutions per mile (km) 618.53 (384.34) 651.08 (404.56) 32.55 (20.22) 5.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19 mph (30.58 km/h)
25 mph (40.23 km/h)23.75 mph (38.22 km/h)
30 mph (48.28 km/h)28.5 mph (45.87 km/h)
35 mph (56.33 km/h)33.25 mph (53.51 km/h)
40 mph (64.37 km/h)38 mph (61.16 km/h)
45 mph (72.42 km/h)42.75 mph (68.8 km/h)
50 mph (80.47 km/h)47.5 mph (76.44 km/h)
55 mph (88.51 km/h)52.25 mph (84.09 km/h)
60 mph (96.56 km/h)57 mph (91.73 km/h)
65 mph (104.61 km/h)61.75 mph (99.38 km/h)
70 mph (112.65 km/h)66.5 mph (107.02 km/h)
75 mph (120.7 km/h)71.25 mph (114.67 km/h)
80 mph (128.75 km/h)76 mph (122.31 km/h)
85 mph (136.79 km/h)80.75 mph (129.96 km/h)
90 mph (144.84 km/h)85.5 mph (137.6 km/h)
95 mph (152.89 km/h)90.25 mph (145.25 km/h)
100 mph (160.93 km/h)95 mph (152.89 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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