Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
31/10r15 vs 275/75r15 Tire Comparison Side By Side
  31/10-15 275/75-15 Difference
Diameter inches (mm) 31 (787.4) 31.24 (793.5) 0.24 (6.1) 0.8%
Width inches (mm) 10 (254) 10.83 (275) 0.83 (21) 8.3%
Circum. inches (mm) 97.39 (2473.69) 98.14 (2492.85) 0.75 (19.16) 0.8%
Sidewall Height inches (mm) 8 (203.2) 8.12 (206.25) 0.12 (3.05) 1.5%
Revolutions per mile (km) 650.58 (404.25) 645.58 (401.15) -5 (-3.11) -0.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.15 mph (32.44 km/h)
25 mph (40.23 km/h)25.19 mph (40.55 km/h)
30 mph (48.28 km/h)30.23 mph (48.65 km/h)
35 mph (56.33 km/h)35.27 mph (56.76 km/h)
40 mph (64.37 km/h)40.31 mph (64.87 km/h)
45 mph (72.42 km/h)45.35 mph (72.98 km/h)
50 mph (80.47 km/h)50.39 mph (81.09 km/h)
55 mph (88.51 km/h)55.43 mph (89.2 km/h)
60 mph (96.56 km/h)60.46 mph (97.31 km/h)
65 mph (104.61 km/h)65.5 mph (105.42 km/h)
70 mph (112.65 km/h)70.54 mph (113.53 km/h)
75 mph (120.7 km/h)75.58 mph (121.64 km/h)
80 mph (128.75 km/h)80.62 mph (129.75 km/h)
85 mph (136.79 km/h)85.66 mph (137.85 km/h)
90 mph (144.84 km/h)90.7 mph (145.96 km/h)
95 mph (152.89 km/h)95.74 mph (154.07 km/h)
100 mph (160.93 km/h)100.77 mph (162.18 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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