Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
205/75r15 vs 215/60r15 Tire Comparison Side By Side
  205/75-15 215/60-15 Difference
Diameter inches (mm) 27.11 (688.5) 25.16 (639) -1.95 (-49.5) -7.2%
Width inches (mm) 8.07 (205) 8.46 (215) 0.39 (10) 4.9%
Circum. inches (mm) 85.16 (2162.99) 79.03 (2007.48) -6.12 (-155.51) -7.2%
Sidewall Height inches (mm) 6.05 (153.75) 5.08 (129) -0.97 (-24.75) -16.1%
Revolutions per mile (km) 744.04 (462.32) 801.67 (498.14) 57.64 (35.81) 7.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.56 mph (29.87 km/h)
25 mph (40.23 km/h)23.2 mph (37.34 km/h)
30 mph (48.28 km/h)27.84 mph (44.81 km/h)
35 mph (56.33 km/h)32.48 mph (52.28 km/h)
40 mph (64.37 km/h)37.12 mph (59.75 km/h)
45 mph (72.42 km/h)41.76 mph (67.21 km/h)
50 mph (80.47 km/h)46.41 mph (74.68 km/h)
55 mph (88.51 km/h)51.05 mph (82.15 km/h)
60 mph (96.56 km/h)55.69 mph (89.62 km/h)
65 mph (104.61 km/h)60.33 mph (97.09 km/h)
70 mph (112.65 km/h)64.97 mph (104.55 km/h)
75 mph (120.7 km/h)69.61 mph (112.02 km/h)
80 mph (128.75 km/h)74.25 mph (119.49 km/h)
85 mph (136.79 km/h)78.89 mph (126.96 km/h)
90 mph (144.84 km/h)83.53 mph (134.43 km/h)
95 mph (152.89 km/h)88.17 mph (141.9 km/h)
100 mph (160.93 km/h)92.81 mph (149.36 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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