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 215/55r17 Tire Comparison Side By Side
  125/70-16 215/55-17 Difference
Diameter inches (mm) 22.89 (581.4) 26.31 (668.3) 3.42 (86.9) 14.9%
Width inches (mm) 4.92 (125) 8.46 (215) 3.54 (90) 72%
Circum. inches (mm) 71.91 (1826.52) 82.66 (2099.53) 10.75 (273) 14.9%
Sidewall Height inches (mm) 3.44 (87.5) 4.66 (118.25) 1.21 (30.75) 35.1%
Revolutions per mile (km) 881.1 (547.49) 766.53 (476.3) -114.57 (-71.19) -13%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)22.99 mph (37 km/h)
25 mph (40.23 km/h)28.74 mph (46.25 km/h)
30 mph (48.28 km/h)34.48 mph (55.5 km/h)
35 mph (56.33 km/h)40.23 mph (64.75 km/h)
40 mph (64.37 km/h)45.98 mph (74 km/h)
45 mph (72.42 km/h)51.73 mph (83.25 km/h)
50 mph (80.47 km/h)57.47 mph (92.49 km/h)
55 mph (88.51 km/h)63.22 mph (101.74 km/h)
60 mph (96.56 km/h)68.97 mph (110.99 km/h)
65 mph (104.61 km/h)74.72 mph (120.24 km/h)
70 mph (112.65 km/h)80.46 mph (129.49 km/h)
75 mph (120.7 km/h)86.21 mph (138.74 km/h)
80 mph (128.75 km/h)91.96 mph (147.99 km/h)
85 mph (136.79 km/h)97.7 mph (157.24 km/h)
90 mph (144.84 km/h)103.45 mph (166.49 km/h)
95 mph (152.89 km/h)109.2 mph (175.74 km/h)
100 mph (160.93 km/h)114.95 mph (184.99 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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