Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
255/70r17 vs 235/75r15 Tire Comparison Side By Side
  255/70-17 235/75-15 Difference
Diameter inches (mm) 31.06 (788.8) 28.88 (733.5) -2.18 (-55.3) -7%
Width inches (mm) 10.04 (255) 9.25 (235) -0.79 (-20) -7.8%
Circum. inches (mm) 97.56 (2478.09) 90.72 (2304.36) -6.84 (-173.73) -7%
Sidewall Height inches (mm) 7.03 (178.5) 6.94 (176.25) -0.09 (-2.25) -1.3%
Revolutions per mile (km) 649.43 (403.54) 698.39 (433.96) 48.96 (30.42) 7.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.6 mph (29.93 km/h)
25 mph (40.23 km/h)23.25 mph (37.41 km/h)
30 mph (48.28 km/h)27.9 mph (44.9 km/h)
35 mph (56.33 km/h)32.55 mph (52.38 km/h)
40 mph (64.37 km/h)37.2 mph (59.86 km/h)
45 mph (72.42 km/h)41.85 mph (67.34 km/h)
50 mph (80.47 km/h)46.49 mph (74.83 km/h)
55 mph (88.51 km/h)51.14 mph (82.31 km/h)
60 mph (96.56 km/h)55.79 mph (89.79 km/h)
65 mph (104.61 km/h)60.44 mph (97.27 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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