Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
125/70r16 vs 135/80r16 Tire Comparison Side By Side
  125/70-16 135/80-16 Difference
Diameter inches (mm) 22.89 (581.4) 24.5 (622.4) 1.61 (41) 7.1%
Width inches (mm) 4.92 (125) 5.31 (135) 0.39 (10) 8%
Circum. inches (mm) 71.91 (1826.52) 76.98 (1955.33) 5.07 (128.81) 7.1%
Sidewall Height inches (mm) 3.44 (87.5) 4.25 (108) 0.81 (20.5) 23.4%
Revolutions per mile (km) 881.1 (547.49) 823.06 (511.42) -58.04 (-36.07) -6.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.41 mph (34.46 km/h)
25 mph (40.23 km/h)26.76 mph (43.07 km/h)
30 mph (48.28 km/h)32.12 mph (51.69 km/h)
35 mph (56.33 km/h)37.47 mph (60.3 km/h)
40 mph (64.37 km/h)42.82 mph (68.91 km/h)
45 mph (72.42 km/h)48.17 mph (77.53 km/h)
50 mph (80.47 km/h)53.53 mph (86.14 km/h)
55 mph (88.51 km/h)58.88 mph (94.76 km/h)
60 mph (96.56 km/h)64.23 mph (103.37 km/h)
65 mph (104.61 km/h)69.58 mph (111.98 km/h)
70 mph (112.65 km/h)74.94 mph (120.6 km/h)
75 mph (120.7 km/h)80.29 mph (129.21 km/h)
80 mph (128.75 km/h)85.64 mph (137.83 km/h)
85 mph (136.79 km/h)90.99 mph (146.44 km/h)
90 mph (144.84 km/h)96.35 mph (155.06 km/h)
95 mph (152.89 km/h)101.7 mph (163.67 km/h)
100 mph (160.93 km/h)107.05 mph (172.28 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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