Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
180/70r15 vs 200/70r15 Tire Comparison Side By Side
  180/70-15 200/70-15 Difference
Diameter inches (mm) 24.92 (633) 26.02 (661) 1.1 (28) 4.4%
Width inches (mm) 7.09 (180) 7.87 (200) 0.79 (20) 11.1%
Circum. inches (mm) 78.29 (1988.63) 81.76 (2076.59) 3.46 (87.96) 4.4%
Sidewall Height inches (mm) 4.96 (126) 5.51 (140) 0.55 (14) 11.1%
Revolutions per mile (km) 809.27 (502.86) 774.99 (481.56) -34.28 (-21.3) -4.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.88 mph (33.61 km/h)
25 mph (40.23 km/h)26.11 mph (42.01 km/h)
30 mph (48.28 km/h)31.33 mph (50.42 km/h)
35 mph (56.33 km/h)36.55 mph (58.82 km/h)
40 mph (64.37 km/h)41.77 mph (67.22 km/h)
45 mph (72.42 km/h)46.99 mph (75.62 km/h)
50 mph (80.47 km/h)52.21 mph (84.03 km/h)
55 mph (88.51 km/h)57.43 mph (92.43 km/h)
60 mph (96.56 km/h)62.65 mph (100.83 km/h)
65 mph (104.61 km/h)67.88 mph (109.23 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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