Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
215/40r18 vs 235/40r18 Tire Comparison Side By Side
  215/40-18 235/40-18 Difference
Diameter inches (mm) 24.77 (629.2) 25.4 (645.2) 0.63 (16) 2.5%
Width inches (mm) 8.46 (215) 9.25 (235) 0.79 (20) 9.3%
Circum. inches (mm) 77.82 (1976.69) 79.8 (2026.96) 1.98 (50.27) 2.5%
Sidewall Height inches (mm) 3.39 (86) 3.7 (94) 0.31 (8) 9.3%
Revolutions per mile (km) 814.16 (505.9) 793.97 (493.35) -20.19 (-12.55) -2.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.51 mph (33.01 km/h)
25 mph (40.23 km/h)25.64 mph (41.26 km/h)
30 mph (48.28 km/h)30.76 mph (49.51 km/h)
35 mph (56.33 km/h)35.89 mph (57.76 km/h)
40 mph (64.37 km/h)41.02 mph (66.01 km/h)
45 mph (72.42 km/h)46.14 mph (74.26 km/h)
50 mph (80.47 km/h)51.27 mph (82.51 km/h)
55 mph (88.51 km/h)56.4 mph (90.76 km/h)
60 mph (96.56 km/h)61.53 mph (99.02 km/h)
65 mph (104.61 km/h)66.65 mph (107.27 km/h)
70 mph (112.65 km/h)71.78 mph (115.52 km/h)
75 mph (120.7 km/h)76.91 mph (123.77 km/h)
80 mph (128.75 km/h)82.03 mph (132.02 km/h)
85 mph (136.79 km/h)87.16 mph (140.27 km/h)
90 mph (144.84 km/h)92.29 mph (148.52 km/h)
95 mph (152.89 km/h)97.42 mph (156.78 km/h)
100 mph (160.93 km/h)102.54 mph (165.03 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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