Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
235/80r17 vs 255/80r17 Tire Comparison Side By Side
  235/80-17 255/80-17 Difference
Diameter inches (mm) 31.8 (807.8) 33.06 (839.8) 1.26 (32) 4%
Width inches (mm) 9.25 (235) 10.04 (255) 0.79 (20) 8.5%
Circum. inches (mm) 99.91 (2537.78) 103.87 (2638.31) 3.96 (100.53) 4%
Sidewall Height inches (mm) 7.4 (188) 8.03 (204) 0.63 (16) 8.5%
Revolutions per mile (km) 634.15 (394.04) 609.99 (379.03) -24.16 (-15.01) -3.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.79 mph (33.46 km/h)
25 mph (40.23 km/h)25.99 mph (41.83 km/h)
30 mph (48.28 km/h)31.19 mph (50.19 km/h)
35 mph (56.33 km/h)36.39 mph (58.56 km/h)
40 mph (64.37 km/h)41.58 mph (66.92 km/h)
45 mph (72.42 km/h)46.78 mph (75.29 km/h)
50 mph (80.47 km/h)51.98 mph (83.65 km/h)
55 mph (88.51 km/h)57.18 mph (92.02 km/h)
60 mph (96.56 km/h)62.38 mph (100.39 km/h)
65 mph (104.61 km/h)67.57 mph (108.75 km/h)
70 mph (112.65 km/h)72.77 mph (117.12 km/h)
75 mph (120.7 km/h)77.97 mph (125.48 km/h)
80 mph (128.75 km/h)83.17 mph (133.85 km/h)
85 mph (136.79 km/h)88.37 mph (142.21 km/h)
90 mph (144.84 km/h)93.57 mph (150.58 km/h)
95 mph (152.89 km/h)98.76 mph (158.94 km/h)
100 mph (160.93 km/h)103.96 mph (167.31 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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