Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
205/70r17 vs 215/55r17 Tire Comparison Side By Side
  205/70-17 215/55-17 Difference
Diameter inches (mm) 28.3 (718.8) 26.31 (668.3) -1.99 (-50.5) -7%
Width inches (mm) 8.07 (205) 8.46 (215) 0.39 (10) 4.9%
Circum. inches (mm) 88.9 (2258.18) 82.66 (2099.53) -6.25 (-158.65) -7%
Sidewall Height inches (mm) 5.65 (143.5) 4.66 (118.25) -0.99 (-25.25) -17.6%
Revolutions per mile (km) 712.67 (442.83) 766.53 (476.3) 53.85 (33.46) 7.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.59 mph (29.93 km/h)
25 mph (40.23 km/h)23.24 mph (37.41 km/h)
30 mph (48.28 km/h)27.89 mph (44.89 km/h)
35 mph (56.33 km/h)32.54 mph (52.37 km/h)
40 mph (64.37 km/h)37.19 mph (59.85 km/h)
45 mph (72.42 km/h)41.84 mph (67.33 km/h)
50 mph (80.47 km/h)46.49 mph (74.81 km/h)
55 mph (88.51 km/h)51.14 mph (82.3 km/h)
60 mph (96.56 km/h)55.78 mph (89.78 km/h)
65 mph (104.61 km/h)60.43 mph (97.26 km/h)
70 mph (112.65 km/h)65.08 mph (104.74 km/h)
75 mph (120.7 km/h)69.73 mph (112.22 km/h)
80 mph (128.75 km/h)74.38 mph (119.7 km/h)
85 mph (136.79 km/h)79.03 mph (127.18 km/h)
90 mph (144.84 km/h)83.68 mph (134.67 km/h)
95 mph (152.89 km/h)88.33 mph (142.15 km/h)
100 mph (160.93 km/h)92.97 mph (149.63 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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