Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
215/40r16 vs 215/45r16 Tire Comparison Side By Side
  215/40-16 215/45-16 Difference
Diameter inches (mm) 22.77 (578.4) 23.62 (599.9) 0.85 (21.5) 3.7%
Width inches (mm) 8.46 (215) 8.46 (215) 0 (0) 0%
Circum. inches (mm) 71.54 (1817.1) 74.2 (1884.64) 2.66 (67.54) 3.7%
Sidewall Height inches (mm) 3.39 (86) 3.81 (96.75) 0.42 (10.75) 12.5%
Revolutions per mile (km) 885.67 (550.33) 853.93 (530.6) -31.74 (-19.72) -3.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.74 mph (33.38 km/h)
25 mph (40.23 km/h)25.93 mph (41.73 km/h)
30 mph (48.28 km/h)31.12 mph (50.08 km/h)
35 mph (56.33 km/h)36.3 mph (58.42 km/h)
40 mph (64.37 km/h)41.49 mph (66.77 km/h)
45 mph (72.42 km/h)46.67 mph (75.11 km/h)
50 mph (80.47 km/h)51.86 mph (83.46 km/h)
55 mph (88.51 km/h)57.04 mph (91.8 km/h)
60 mph (96.56 km/h)62.23 mph (100.15 km/h)
65 mph (104.61 km/h)67.42 mph (108.5 km/h)
70 mph (112.65 km/h)72.6 mph (116.84 km/h)
75 mph (120.7 km/h)77.79 mph (125.19 km/h)
80 mph (128.75 km/h)82.97 mph (133.53 km/h)
85 mph (136.79 km/h)88.16 mph (141.88 km/h)
90 mph (144.84 km/h)93.35 mph (150.23 km/h)
95 mph (152.89 km/h)98.53 mph (158.57 km/h)
100 mph (160.93 km/h)103.72 mph (166.92 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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