Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
135/90r17 vs 217/45r17 Tire Comparison Side By Side
  135/90-17 217/45-17 Difference
Diameter inches (mm) 26.57 (674.8) 24.69 (627.1) -1.88 (-47.7) -7.1%
Width inches (mm) 5.31 (135) 8.54 (217) 3.23 (82) 60.7%
Circum. inches (mm) 83.46 (2119.95) 77.56 (1970.09) -5.9 (-149.85) -7.1%
Sidewall Height inches (mm) 4.78 (121.5) 3.84 (97.65) -0.94 (-23.85) -19.6%
Revolutions per mile (km) 759.14 (471.71) 816.89 (507.59) 57.74 (35.88) 7.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.59 mph (29.91 km/h)
25 mph (40.23 km/h)23.23 mph (37.39 km/h)
30 mph (48.28 km/h)27.88 mph (44.87 km/h)
35 mph (56.33 km/h)32.53 mph (52.35 km/h)
40 mph (64.37 km/h)37.17 mph (59.82 km/h)
45 mph (72.42 km/h)41.82 mph (67.3 km/h)
50 mph (80.47 km/h)46.47 mph (74.78 km/h)
55 mph (88.51 km/h)51.11 mph (82.26 km/h)
60 mph (96.56 km/h)55.76 mph (89.74 km/h)
65 mph (104.61 km/h)60.41 mph (97.21 km/h)
70 mph (112.65 km/h)65.05 mph (104.69 km/h)
75 mph (120.7 km/h)69.7 mph (112.17 km/h)
80 mph (128.75 km/h)74.34 mph (119.65 km/h)
85 mph (136.79 km/h)78.99 mph (127.12 km/h)
90 mph (144.84 km/h)83.64 mph (134.6 km/h)
95 mph (152.89 km/h)88.28 mph (142.08 km/h)
100 mph (160.93 km/h)92.93 mph (149.56 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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