Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
240/45r18 vs 215/60r16 Tire Comparison Side By Side
  240/45-18 215/60-16 Difference
Diameter inches (mm) 26.5 (673.2) 26.16 (664.4) -0.35 (-8.8) -1.3%
Width inches (mm) 9.45 (240) 8.46 (215) -0.98 (-25) -10.4%
Circum. inches (mm) 83.26 (2114.92) 82.18 (2087.27) -1.09 (-27.65) -1.3%
Sidewall Height inches (mm) 4.25 (108) 5.08 (129) 0.83 (21) 19.4%
Revolutions per mile (km) 760.95 (472.83) 771.03 (479.09) 10.08 (6.26) 1.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.74 mph (31.77 km/h)
25 mph (40.23 km/h)24.67 mph (39.71 km/h)
30 mph (48.28 km/h)29.61 mph (47.65 km/h)
35 mph (56.33 km/h)34.54 mph (55.59 km/h)
40 mph (64.37 km/h)39.48 mph (63.53 km/h)
45 mph (72.42 km/h)44.41 mph (71.47 km/h)
50 mph (80.47 km/h)49.35 mph (79.42 km/h)
55 mph (88.51 km/h)54.28 mph (87.36 km/h)
60 mph (96.56 km/h)59.22 mph (95.3 km/h)
65 mph (104.61 km/h)64.15 mph (103.24 km/h)
70 mph (112.65 km/h)69.08 mph (111.18 km/h)
75 mph (120.7 km/h)74.02 mph (119.12 km/h)
80 mph (128.75 km/h)78.95 mph (127.06 km/h)
85 mph (136.79 km/h)83.89 mph (135.01 km/h)
90 mph (144.84 km/h)88.82 mph (142.95 km/h)
95 mph (152.89 km/h)93.76 mph (150.89 km/h)
100 mph (160.93 km/h)98.69 mph (158.83 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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