Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
225/70r15 vs 235/75r15 Tire Comparison Side By Side
  225/70-15 235/75-15 Difference
Diameter inches (mm) 27.4 (696) 28.88 (733.5) 1.48 (37.5) 5.4%
Width inches (mm) 8.86 (225) 9.25 (235) 0.39 (10) 4.4%
Circum. inches (mm) 86.08 (2186.55) 90.72 (2304.36) 4.64 (117.81) 5.4%
Sidewall Height inches (mm) 6.2 (157.5) 6.94 (176.25) 0.74 (18.75) 11.9%
Revolutions per mile (km) 736.02 (457.34) 698.39 (433.96) -37.63 (-23.38) -5.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.08 mph (33.92 km/h)
25 mph (40.23 km/h)26.35 mph (42.4 km/h)
30 mph (48.28 km/h)31.62 mph (50.88 km/h)
35 mph (56.33 km/h)36.89 mph (59.36 km/h)
40 mph (64.37 km/h)42.16 mph (67.84 km/h)
45 mph (72.42 km/h)47.42 mph (76.32 km/h)
50 mph (80.47 km/h)52.69 mph (84.8 km/h)
55 mph (88.51 km/h)57.96 mph (93.28 km/h)
60 mph (96.56 km/h)63.23 mph (101.76 km/h)
65 mph (104.61 km/h)68.5 mph (110.24 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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