Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
135/80r16 vs 125/70r16 Tire Comparison Side By Side
  135/80-16 125/70-16 Difference
Diameter inches (mm) 24.5 (622.4) 22.89 (581.4) -1.61 (-41) -6.6%
Width inches (mm) 5.31 (135) 4.92 (125) -0.39 (-10) -7.4%
Circum. inches (mm) 76.98 (1955.33) 71.91 (1826.52) -5.07 (-128.81) -6.6%
Sidewall Height inches (mm) 4.25 (108) 3.44 (87.5) -0.81 (-20.5) -19%
Revolutions per mile (km) 823.06 (511.42) 881.1 (547.49) 58.04 (36.07) 7.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.68 mph (30.07 km/h)
25 mph (40.23 km/h)23.35 mph (37.58 km/h)
30 mph (48.28 km/h)28.02 mph (45.1 km/h)
35 mph (56.33 km/h)32.69 mph (52.62 km/h)
40 mph (64.37 km/h)37.37 mph (60.13 km/h)
45 mph (72.42 km/h)42.04 mph (67.65 km/h)
50 mph (80.47 km/h)46.71 mph (75.17 km/h)
55 mph (88.51 km/h)51.38 mph (82.68 km/h)
60 mph (96.56 km/h)56.05 mph (90.2 km/h)
65 mph (104.61 km/h)60.72 mph (97.72 km/h)
70 mph (112.65 km/h)65.39 mph (105.23 km/h)
75 mph (120.7 km/h)70.06 mph (112.75 km/h)
80 mph (128.75 km/h)74.73 mph (120.27 km/h)
85 mph (136.79 km/h)79.4 mph (127.78 km/h)
90 mph (144.84 km/h)84.07 mph (135.3 km/h)
95 mph (152.89 km/h)88.74 mph (142.82 km/h)
100 mph (160.93 km/h)93.41 mph (150.33 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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