Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
255/70r15 vs 235/70r16 Tire Comparison Side By Side
  255/70-15 235/70-16 Difference
Diameter inches (mm) 29.06 (738) 28.95 (735.4) -0.1 (-2.6) -0.4%
Width inches (mm) 10.04 (255) 9.25 (235) -0.79 (-20) -7.8%
Circum. inches (mm) 91.28 (2318.5) 90.96 (2310.33) -0.32 (-8.17) -0.4%
Sidewall Height inches (mm) 7.03 (178.5) 6.48 (164.5) -0.55 (-14) -7.8%
Revolutions per mile (km) 694.13 (431.31) 696.59 (432.84) 2.45 (1.52) 0.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.93 mph (32.07 km/h)
25 mph (40.23 km/h)24.91 mph (40.09 km/h)
30 mph (48.28 km/h)29.89 mph (48.11 km/h)
35 mph (56.33 km/h)34.88 mph (56.13 km/h)
40 mph (64.37 km/h)39.86 mph (64.15 km/h)
45 mph (72.42 km/h)44.84 mph (72.17 km/h)
50 mph (80.47 km/h)49.82 mph (80.18 km/h)
55 mph (88.51 km/h)54.81 mph (88.2 km/h)
60 mph (96.56 km/h)59.79 mph (96.22 km/h)
65 mph (104.61 km/h)64.77 mph (104.24 km/h)
70 mph (112.65 km/h)69.75 mph (112.26 km/h)
75 mph (120.7 km/h)74.74 mph (120.28 km/h)
80 mph (128.75 km/h)79.72 mph (128.29 km/h)
85 mph (136.79 km/h)84.7 mph (136.31 km/h)
90 mph (144.84 km/h)89.68 mph (144.33 km/h)
95 mph (152.89 km/h)94.67 mph (152.35 km/h)
100 mph (160.93 km/h)99.65 mph (160.37 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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