Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
35/12r16 vs 385/70r16 Tire Comparison Side By Side
  35/12-16 385/70-16 Difference
Diameter inches (mm) 34.97 (888.3) 37.22 (945.4) 2.25 (57.1) 6.4%
Width inches (mm) 12.01 (305) 15.16 (385) 3.15 (80) 26.2%
Circum. inches (mm) 109.87 (2790.68) 116.93 (2970.06) 7.06 (179.38) 6.4%
Sidewall Height inches (mm) 9.49 (240.95) 10.61 (269.5) 1.12 (28.55) 11.8%
Revolutions per mile (km) 576.69 (358.34) 541.86 (336.69) -34.83 (-21.64) -6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.29 mph (34.26 km/h)
25 mph (40.23 km/h)26.61 mph (42.82 km/h)
30 mph (48.28 km/h)31.93 mph (51.38 km/h)
35 mph (56.33 km/h)37.25 mph (59.95 km/h)
40 mph (64.37 km/h)42.57 mph (68.51 km/h)
45 mph (72.42 km/h)47.89 mph (77.08 km/h)
50 mph (80.47 km/h)53.21 mph (85.64 km/h)
55 mph (88.51 km/h)58.54 mph (94.2 km/h)
60 mph (96.56 km/h)63.86 mph (102.77 km/h)
65 mph (104.61 km/h)69.18 mph (111.33 km/h)
70 mph (112.65 km/h)74.5 mph (119.9 km/h)
75 mph (120.7 km/h)79.82 mph (128.46 km/h)
80 mph (128.75 km/h)85.14 mph (137.02 km/h)
85 mph (136.79 km/h)90.46 mph (145.59 km/h)
90 mph (144.84 km/h)95.79 mph (154.15 km/h)
95 mph (152.89 km/h)101.11 mph (162.72 km/h)
100 mph (160.93 km/h)106.43 mph (171.28 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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