Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
170/80r15 vs 150/80r15 Tire Comparison Side By Side
  170/80-15 150/80-15 Difference
Diameter inches (mm) 25.71 (653) 24.45 (621) -1.26 (-32) -4.9%
Width inches (mm) 6.69 (170) 5.91 (150) -0.79 (-20) -11.8%
Circum. inches (mm) 80.77 (2051.46) 76.81 (1950.93) -3.96 (-100.53) -4.9%
Sidewall Height inches (mm) 5.35 (136) 4.72 (120) -0.63 (-16) -11.8%
Revolutions per mile (km) 784.49 (487.46) 824.91 (512.58) 40.42 (25.12) 5.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.02 mph (30.61 km/h)
25 mph (40.23 km/h)23.77 mph (38.26 km/h)
30 mph (48.28 km/h)28.53 mph (45.91 km/h)
35 mph (56.33 km/h)33.28 mph (53.57 km/h)
40 mph (64.37 km/h)38.04 mph (61.22 km/h)
45 mph (72.42 km/h)42.79 mph (68.87 km/h)
50 mph (80.47 km/h)47.55 mph (76.52 km/h)
55 mph (88.51 km/h)52.3 mph (84.18 km/h)
60 mph (96.56 km/h)57.06 mph (91.83 km/h)
65 mph (104.61 km/h)61.81 mph (99.48 km/h)
70 mph (112.65 km/h)66.57 mph (107.13 km/h)
75 mph (120.7 km/h)71.32 mph (114.79 km/h)
80 mph (128.75 km/h)76.08 mph (122.44 km/h)
85 mph (136.79 km/h)80.83 mph (130.09 km/h)
90 mph (144.84 km/h)85.59 mph (137.74 km/h)
95 mph (152.89 km/h)90.34 mph (145.4 km/h)
100 mph (160.93 km/h)95.1 mph (153.05 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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