Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
125/80r17 vs 215/55r17 Tire Comparison Side By Side
  125/80-17 215/55-17 Difference
Diameter inches (mm) 24.87 (631.8) 26.31 (668.3) 1.44 (36.5) 5.8%
Width inches (mm) 4.92 (125) 8.46 (215) 3.54 (90) 72%
Circum. inches (mm) 78.14 (1984.86) 82.66 (2099.53) 4.51 (114.67) 5.8%
Sidewall Height inches (mm) 3.94 (100) 4.66 (118.25) 0.72 (18.25) 18.3%
Revolutions per mile (km) 810.81 (503.81) 766.53 (476.3) -44.28 (-27.52) -5.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.16 mph (34.05 km/h)
25 mph (40.23 km/h)26.44 mph (42.56 km/h)
30 mph (48.28 km/h)31.73 mph (51.07 km/h)
35 mph (56.33 km/h)37.02 mph (59.58 km/h)
40 mph (64.37 km/h)42.31 mph (68.09 km/h)
45 mph (72.42 km/h)47.6 mph (76.6 km/h)
50 mph (80.47 km/h)52.89 mph (85.12 km/h)
55 mph (88.51 km/h)58.18 mph (93.63 km/h)
60 mph (96.56 km/h)63.47 mph (102.14 km/h)
65 mph (104.61 km/h)68.76 mph (110.65 km/h)
70 mph (112.65 km/h)74.04 mph (119.16 km/h)
75 mph (120.7 km/h)79.33 mph (127.67 km/h)
80 mph (128.75 km/h)84.62 mph (136.19 km/h)
85 mph (136.79 km/h)89.91 mph (144.7 km/h)
90 mph (144.84 km/h)95.2 mph (153.21 km/h)
95 mph (152.89 km/h)100.49 mph (161.72 km/h)
100 mph (160.93 km/h)105.78 mph (170.23 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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