Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
225/60r16 vs 245/40r18 Tire Comparison Side By Side
  225/60-16 245/40-18 Difference
Diameter inches (mm) 26.63 (676.4) 25.72 (653.2) -0.91 (-23.2) -3.4%
Width inches (mm) 8.86 (225) 9.65 (245) 0.79 (20) 8.9%
Circum. inches (mm) 83.66 (2124.97) 80.79 (2052.09) -2.87 (-72.88) -3.4%
Sidewall Height inches (mm) 5.31 (135) 3.86 (98) -1.46 (-37) -27.4%
Revolutions per mile (km) 757.35 (470.59) 784.25 (487.31) 26.9 (16.71) 3.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.31 mph (31.08 km/h)
25 mph (40.23 km/h)24.14 mph (38.85 km/h)
30 mph (48.28 km/h)28.97 mph (46.62 km/h)
35 mph (56.33 km/h)33.8 mph (54.4 km/h)
40 mph (64.37 km/h)38.63 mph (62.17 km/h)
45 mph (72.42 km/h)43.46 mph (69.94 km/h)
50 mph (80.47 km/h)48.29 mph (77.71 km/h)
55 mph (88.51 km/h)53.11 mph (85.48 km/h)
60 mph (96.56 km/h)57.94 mph (93.25 km/h)
65 mph (104.61 km/h)62.77 mph (101.02 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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