Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
165/60r20 vs 31/12.5r20 Tire Comparison Side By Side
  165/60-20 31/12.5-20 Difference
Diameter inches (mm) 27.8 (706) 31.02 (787.84) 3.22 (81.84) 11.6%
Width inches (mm) 6.5 (165) 12.52 (318) 6.02 (153) 92.7%
Circum. inches (mm) 87.32 (2217.96) 97.44 (2475.07) 10.12 (257.11) 11.6%
Sidewall Height inches (mm) 3.9 (99) 5.51 (139.92) 1.61 (40.92) 41.3%
Revolutions per mile (km) 725.6 (450.86) 650.22 (404.03) -75.37 (-46.84) -10.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)22.32 mph (35.92 km/h)
25 mph (40.23 km/h)27.9 mph (44.9 km/h)
30 mph (48.28 km/h)33.48 mph (53.88 km/h)
35 mph (56.33 km/h)39.06 mph (62.86 km/h)
40 mph (64.37 km/h)44.64 mph (71.84 km/h)
45 mph (72.42 km/h)50.22 mph (80.82 km/h)
50 mph (80.47 km/h)55.8 mph (89.8 km/h)
55 mph (88.51 km/h)61.38 mph (98.77 km/h)
60 mph (96.56 km/h)66.96 mph (107.75 km/h)
65 mph (104.61 km/h)72.53 mph (116.73 km/h)
70 mph (112.65 km/h)78.11 mph (125.71 km/h)
75 mph (120.7 km/h)83.69 mph (134.69 km/h)
80 mph (128.75 km/h)89.27 mph (143.67 km/h)
85 mph (136.79 km/h)94.85 mph (152.65 km/h)
90 mph (144.84 km/h)100.43 mph (161.63 km/h)
95 mph (152.89 km/h)106.01 mph (170.61 km/h)
100 mph (160.93 km/h)111.59 mph (179.59 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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