Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
235/55r15 vs 205/60r15 Tire Comparison Side By Side
  235/55-15 205/60-15 Difference
Diameter inches (mm) 25.18 (639.5) 24.69 (627) -0.49 (-12.5) -2%
Width inches (mm) 9.25 (235) 8.07 (205) -1.18 (-30) -12.8%
Circum. inches (mm) 79.1 (2009.05) 77.55 (1969.78) -1.55 (-39.27) -2%
Sidewall Height inches (mm) 5.09 (129.25) 4.84 (123) -0.25 (-6.25) -4.8%
Revolutions per mile (km) 801.05 (497.75) 817.02 (507.67) 15.97 (9.92) 2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.61 mph (31.56 km/h)
25 mph (40.23 km/h)24.51 mph (39.45 km/h)
30 mph (48.28 km/h)29.41 mph (47.34 km/h)
35 mph (56.33 km/h)34.32 mph (55.23 km/h)
40 mph (64.37 km/h)39.22 mph (63.12 km/h)
45 mph (72.42 km/h)44.12 mph (71.01 km/h)
50 mph (80.47 km/h)49.02 mph (78.89 km/h)
55 mph (88.51 km/h)53.92 mph (86.78 km/h)
60 mph (96.56 km/h)58.83 mph (94.67 km/h)
65 mph (104.61 km/h)63.73 mph (102.56 km/h)
70 mph (112.65 km/h)68.63 mph (110.45 km/h)
75 mph (120.7 km/h)73.53 mph (118.34 km/h)
80 mph (128.75 km/h)78.44 mph (126.23 km/h)
85 mph (136.79 km/h)83.34 mph (134.12 km/h)
90 mph (144.84 km/h)88.24 mph (142.01 km/h)
95 mph (152.89 km/h)93.14 mph (149.9 km/h)
100 mph (160.93 km/h)98.05 mph (157.79 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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