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 255/75r17 Tire Comparison Side By Side
  235/80-17 255/75-17 Difference
Diameter inches (mm) 31.8 (807.8) 32.06 (814.3) 0.26 (6.5) 0.8%
Width inches (mm) 9.25 (235) 10.04 (255) 0.79 (20) 8.5%
Circum. inches (mm) 99.91 (2537.78) 100.72 (2558.2) 0.8 (20.42) 0.8%
Sidewall Height inches (mm) 7.4 (188) 7.53 (191.25) 0.13 (3.25) 1.7%
Revolutions per mile (km) 634.15 (394.04) 629.09 (390.9) -5.06 (-3.15) -0.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.16 mph (32.45 km/h)
25 mph (40.23 km/h)25.2 mph (40.56 km/h)
30 mph (48.28 km/h)30.24 mph (48.67 km/h)
35 mph (56.33 km/h)35.28 mph (56.78 km/h)
40 mph (64.37 km/h)40.32 mph (64.89 km/h)
45 mph (72.42 km/h)45.36 mph (73 km/h)
50 mph (80.47 km/h)50.4 mph (81.11 km/h)
55 mph (88.51 km/h)55.44 mph (89.23 km/h)
60 mph (96.56 km/h)60.48 mph (97.34 km/h)
65 mph (104.61 km/h)65.52 mph (105.45 km/h)
70 mph (112.65 km/h)70.56 mph (113.56 km/h)
75 mph (120.7 km/h)75.6 mph (121.67 km/h)
80 mph (128.75 km/h)80.64 mph (129.78 km/h)
85 mph (136.79 km/h)85.68 mph (137.9 km/h)
90 mph (144.84 km/h)90.72 mph (146.01 km/h)
95 mph (152.89 km/h)95.76 mph (154.12 km/h)
100 mph (160.93 km/h)100.8 mph (162.23 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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