Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
175/70r14 vs 215/40r17 Tire Comparison Side By Side
  175/70-14 215/40-17 Difference
Diameter inches (mm) 23.65 (600.6) 23.77 (603.8) 0.13 (3.2) 0.5%
Width inches (mm) 6.89 (175) 8.46 (215) 1.57 (40) 22.9%
Circum. inches (mm) 74.29 (1886.84) 74.68 (1896.89) 0.4 (10.05) 0.5%
Sidewall Height inches (mm) 4.82 (122.5) 3.39 (86) -1.44 (-36.5) -29.8%
Revolutions per mile (km) 852.93 (529.99) 848.41 (527.18) -4.52 (-2.81) -0.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.11 mph (32.36 km/h)
25 mph (40.23 km/h)25.13 mph (40.45 km/h)
30 mph (48.28 km/h)30.16 mph (48.54 km/h)
35 mph (56.33 km/h)35.19 mph (56.63 km/h)
40 mph (64.37 km/h)40.21 mph (64.72 km/h)
45 mph (72.42 km/h)45.24 mph (72.81 km/h)
50 mph (80.47 km/h)50.27 mph (80.9 km/h)
55 mph (88.51 km/h)55.29 mph (88.99 km/h)
60 mph (96.56 km/h)60.32 mph (97.08 km/h)
65 mph (104.61 km/h)65.35 mph (105.16 km/h)
70 mph (112.65 km/h)70.37 mph (113.25 km/h)
75 mph (120.7 km/h)75.4 mph (121.34 km/h)
80 mph (128.75 km/h)80.43 mph (129.43 km/h)
85 mph (136.79 km/h)85.45 mph (137.52 km/h)
90 mph (144.84 km/h)90.48 mph (145.61 km/h)
95 mph (152.89 km/h)95.51 mph (153.7 km/h)
100 mph (160.93 km/h)100.53 mph (161.79 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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