Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
140/80r15 vs 150/80r15 Tire Comparison Side By Side
  140/80-15 150/80-15 Difference
Diameter inches (mm) 23.82 (605) 24.45 (621) 0.63 (16) 2.6%
Width inches (mm) 5.51 (140) 5.91 (150) 0.39 (10) 7.1%
Circum. inches (mm) 74.83 (1900.66) 76.81 (1950.93) 1.98 (50.27) 2.6%
Sidewall Height inches (mm) 4.41 (112) 4.72 (120) 0.31 (8) 7.1%
Revolutions per mile (km) 846.73 (526.13) 824.91 (512.58) -21.82 (-13.56) -2.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.53 mph (33.04 km/h)
25 mph (40.23 km/h)25.66 mph (41.3 km/h)
30 mph (48.28 km/h)30.79 mph (49.56 km/h)
35 mph (56.33 km/h)35.93 mph (57.82 km/h)
40 mph (64.37 km/h)41.06 mph (66.08 km/h)
45 mph (72.42 km/h)46.19 mph (74.34 km/h)
50 mph (80.47 km/h)51.32 mph (82.6 km/h)
55 mph (88.51 km/h)56.45 mph (90.85 km/h)
60 mph (96.56 km/h)61.59 mph (99.11 km/h)
65 mph (104.61 km/h)66.72 mph (107.37 km/h)
70 mph (112.65 km/h)71.85 mph (115.63 km/h)
75 mph (120.7 km/h)76.98 mph (123.89 km/h)
80 mph (128.75 km/h)82.12 mph (132.15 km/h)
85 mph (136.79 km/h)87.25 mph (140.41 km/h)
90 mph (144.84 km/h)92.38 mph (148.67 km/h)
95 mph (152.89 km/h)97.51 mph (156.93 km/h)
100 mph (160.93 km/h)102.64 mph (165.19 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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