Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
150/80r15 vs 165/70r15 Tire Comparison Side By Side
  150/80-15 165/70-15 Difference
Diameter inches (mm) 24.45 (621) 24.09 (612) -0.35 (-9) -1.4%
Width inches (mm) 5.91 (150) 6.5 (165) 0.59 (15) 10%
Circum. inches (mm) 76.81 (1950.93) 75.7 (1922.65) -1.11 (-28.27) -1.4%
Sidewall Height inches (mm) 4.72 (120) 4.55 (115.5) -0.18 (-4.5) -3.8%
Revolutions per mile (km) 824.91 (512.58) 837.04 (520.11) 12.13 (7.54) 1.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.71 mph (31.72 km/h)
25 mph (40.23 km/h)24.64 mph (39.65 km/h)
30 mph (48.28 km/h)29.57 mph (47.58 km/h)
35 mph (56.33 km/h)34.49 mph (55.51 km/h)
40 mph (64.37 km/h)39.42 mph (63.44 km/h)
45 mph (72.42 km/h)44.35 mph (71.37 km/h)
50 mph (80.47 km/h)49.28 mph (79.3 km/h)
55 mph (88.51 km/h)54.2 mph (87.23 km/h)
60 mph (96.56 km/h)59.13 mph (95.16 km/h)
65 mph (104.61 km/h)64.06 mph (103.09 km/h)
70 mph (112.65 km/h)68.99 mph (111.02 km/h)
75 mph (120.7 km/h)73.91 mph (118.95 km/h)
80 mph (128.75 km/h)78.84 mph (126.88 km/h)
85 mph (136.79 km/h)83.77 mph (134.81 km/h)
90 mph (144.84 km/h)88.7 mph (142.74 km/h)
95 mph (152.89 km/h)93.62 mph (150.67 km/h)
100 mph (160.93 km/h)98.55 mph (158.6 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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