Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
31/10.5r15 vs 275/75r15 Tire Comparison Side By Side
  31/10.5-15 275/75-15 Difference
Diameter inches (mm) 30.98 (786.84) 31.24 (793.5) 0.26 (6.66) 0.8%
Width inches (mm) 10.51 (267) 10.83 (275) 0.31 (8) 3%
Circum. inches (mm) 97.32 (2471.93) 98.14 (2492.85) 0.82 (20.92) 0.8%
Sidewall Height inches (mm) 7.99 (202.92) 8.12 (206.25) 0.13 (3.33) 1.6%
Revolutions per mile (km) 651.05 (404.54) 645.58 (401.15) -5.46 (-3.4) -0.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.17 mph (32.46 km/h)
25 mph (40.23 km/h)25.21 mph (40.57 km/h)
30 mph (48.28 km/h)30.25 mph (48.69 km/h)
35 mph (56.33 km/h)35.3 mph (56.8 km/h)
40 mph (64.37 km/h)40.34 mph (64.92 km/h)
45 mph (72.42 km/h)45.38 mph (73.03 km/h)
50 mph (80.47 km/h)50.42 mph (81.15 km/h)
55 mph (88.51 km/h)55.47 mph (89.26 km/h)
60 mph (96.56 km/h)60.51 mph (97.38 km/h)
65 mph (104.61 km/h)65.55 mph (105.49 km/h)
70 mph (112.65 km/h)70.59 mph (113.61 km/h)
75 mph (120.7 km/h)75.63 mph (121.72 km/h)
80 mph (128.75 km/h)80.68 mph (129.84 km/h)
85 mph (136.79 km/h)85.72 mph (137.95 km/h)
90 mph (144.84 km/h)90.76 mph (146.07 km/h)
95 mph (152.89 km/h)95.8 mph (154.18 km/h)
100 mph (160.93 km/h)100.85 mph (162.3 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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