Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
125/90r16 vs 215/55r17 Tire Comparison Side By Side
  125/90-16 215/55-17 Difference
Diameter inches (mm) 24.86 (631.4) 26.31 (668.3) 1.45 (36.9) 5.8%
Width inches (mm) 4.92 (125) 8.46 (215) 3.54 (90) 72%
Circum. inches (mm) 78.09 (1983.6) 82.66 (2099.53) 4.56 (115.92) 5.8%
Sidewall Height inches (mm) 4.43 (112.5) 4.66 (118.25) 0.23 (5.75) 5.1%
Revolutions per mile (km) 811.32 (504.13) 766.53 (476.3) -44.8 (-27.84) -5.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.17 mph (34.07 km/h)
25 mph (40.23 km/h)26.46 mph (42.58 km/h)
30 mph (48.28 km/h)31.75 mph (51.1 km/h)
35 mph (56.33 km/h)37.05 mph (59.62 km/h)
40 mph (64.37 km/h)42.34 mph (68.14 km/h)
45 mph (72.42 km/h)47.63 mph (76.65 km/h)
50 mph (80.47 km/h)52.92 mph (85.17 km/h)
55 mph (88.51 km/h)58.21 mph (93.69 km/h)
60 mph (96.56 km/h)63.51 mph (102.2 km/h)
65 mph (104.61 km/h)68.8 mph (110.72 km/h)
70 mph (112.65 km/h)74.09 mph (119.24 km/h)
75 mph (120.7 km/h)79.38 mph (127.75 km/h)
80 mph (128.75 km/h)84.68 mph (136.27 km/h)
85 mph (136.79 km/h)89.97 mph (144.79 km/h)
90 mph (144.84 km/h)95.26 mph (153.31 km/h)
95 mph (152.89 km/h)100.55 mph (161.82 km/h)
100 mph (160.93 km/h)105.84 mph (170.34 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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