Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
245/55r17 vs 225/65r17 Tire Comparison Side By Side
  245/55-17 225/65-17 Difference
Diameter inches (mm) 27.61 (701.3) 28.52 (724.3) 0.91 (23) 3.3%
Width inches (mm) 9.65 (245) 8.86 (225) -0.79 (-20) -8.2%
Circum. inches (mm) 86.74 (2203.2) 89.58 (2275.46) 2.84 (72.26) 3.3%
Sidewall Height inches (mm) 5.31 (134.75) 5.76 (146.25) 0.45 (11.5) 8.5%
Revolutions per mile (km) 730.46 (453.88) 707.26 (439.47) -23.2 (-14.41) -3.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.66 mph (33.24 km/h)
25 mph (40.23 km/h)25.82 mph (41.55 km/h)
30 mph (48.28 km/h)30.98 mph (49.86 km/h)
35 mph (56.33 km/h)36.15 mph (58.17 km/h)
40 mph (64.37 km/h)41.31 mph (66.49 km/h)
45 mph (72.42 km/h)46.48 mph (74.8 km/h)
50 mph (80.47 km/h)51.64 mph (83.11 km/h)
55 mph (88.51 km/h)56.8 mph (91.42 km/h)
60 mph (96.56 km/h)61.97 mph (99.73 km/h)
65 mph (104.61 km/h)67.13 mph (108.04 km/h)
70 mph (112.65 km/h)72.3 mph (116.35 km/h)
75 mph (120.7 km/h)77.46 mph (124.66 km/h)
80 mph (128.75 km/h)82.62 mph (132.97 km/h)
85 mph (136.79 km/h)87.79 mph (141.28 km/h)
90 mph (144.84 km/h)92.95 mph (149.59 km/h)
95 mph (152.89 km/h)98.12 mph (157.9 km/h)
100 mph (160.93 km/h)103.28 mph (166.21 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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