Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
275/40r17 vs 245/40r18 Tire Comparison Side By Side
  275/40-17 245/40-18 Difference
Diameter inches (mm) 25.66 (651.8) 25.72 (653.2) 0.06 (1.4) 0.2%
Width inches (mm) 10.83 (275) 9.65 (245) -1.18 (-30) -10.9%
Circum. inches (mm) 80.62 (2047.69) 80.79 (2052.09) 0.17 (4.4) 0.2%
Sidewall Height inches (mm) 4.33 (110) 3.86 (98) -0.47 (-12) -10.9%
Revolutions per mile (km) 785.93 (488.35) 784.25 (487.31) -1.68 (-1.05) -0.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.04 mph (32.26 km/h)
25 mph (40.23 km/h)25.05 mph (40.32 km/h)
30 mph (48.28 km/h)30.06 mph (48.38 km/h)
35 mph (56.33 km/h)35.08 mph (56.45 km/h)
40 mph (64.37 km/h)40.09 mph (64.51 km/h)
45 mph (72.42 km/h)45.1 mph (72.58 km/h)
50 mph (80.47 km/h)50.11 mph (80.64 km/h)
55 mph (88.51 km/h)55.12 mph (88.7 km/h)
60 mph (96.56 km/h)60.13 mph (96.77 km/h)
65 mph (104.61 km/h)65.14 mph (104.83 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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