Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
275/60r20 vs 35/12.5r20 Tire Comparison Side By Side
  275/60-20 35/12.5-20 Difference
Diameter inches (mm) 32.99 (838) 35.02 (889.6) 2.03 (51.6) 6.2%
Width inches (mm) 10.83 (275) 12.52 (318) 1.69 (43) 15.6%
Circum. inches (mm) 103.65 (2632.65) 110.03 (2794.76) 6.38 (162.11) 6.2%
Sidewall Height inches (mm) 6.5 (165) 7.51 (190.8) 1.02 (25.8) 15.6%
Revolutions per mile (km) 611.3 (379.84) 575.84 (357.81) -35.46 (-22.03) -5.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.23 mph (34.17 km/h)
25 mph (40.23 km/h)26.54 mph (42.71 km/h)
30 mph (48.28 km/h)31.85 mph (51.25 km/h)
35 mph (56.33 km/h)37.16 mph (59.8 km/h)
40 mph (64.37 km/h)42.46 mph (68.34 km/h)
45 mph (72.42 km/h)47.77 mph (76.88 km/h)
50 mph (80.47 km/h)53.08 mph (85.42 km/h)
55 mph (88.51 km/h)58.39 mph (93.96 km/h)
60 mph (96.56 km/h)63.69 mph (102.51 km/h)
65 mph (104.61 km/h)69 mph (111.05 km/h)
70 mph (112.65 km/h)74.31 mph (119.59 km/h)
75 mph (120.7 km/h)79.62 mph (128.13 km/h)
80 mph (128.75 km/h)84.93 mph (136.68 km/h)
85 mph (136.79 km/h)90.23 mph (145.22 km/h)
90 mph (144.84 km/h)95.54 mph (153.76 km/h)
95 mph (152.89 km/h)100.85 mph (162.3 km/h)
100 mph (160.93 km/h)106.16 mph (170.84 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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