Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
245/60r17 vs 245/70r17 Tire Comparison Side By Side
  245/60-17 245/70-17 Difference
Diameter inches (mm) 28.57 (725.8) 30.5 (774.8) 1.93 (49) 6.8%
Width inches (mm) 9.65 (245) 9.65 (245) 0 (0) 0%
Circum. inches (mm) 89.77 (2280.17) 95.83 (2434.11) 6.06 (153.94) 6.8%
Sidewall Height inches (mm) 5.79 (147) 6.75 (171.5) 0.96 (24.5) 16.7%
Revolutions per mile (km) 705.8 (438.56) 661.16 (410.83) -44.64 (-27.74) -6.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.35 mph (34.36 km/h)
25 mph (40.23 km/h)26.69 mph (42.95 km/h)
30 mph (48.28 km/h)32.03 mph (51.54 km/h)
35 mph (56.33 km/h)37.36 mph (60.13 km/h)
40 mph (64.37 km/h)42.7 mph (68.72 km/h)
45 mph (72.42 km/h)48.04 mph (77.31 km/h)
50 mph (80.47 km/h)53.38 mph (85.9 km/h)
55 mph (88.51 km/h)58.71 mph (94.49 km/h)
60 mph (96.56 km/h)64.05 mph (103.08 km/h)
65 mph (104.61 km/h)69.39 mph (111.67 km/h)
70 mph (112.65 km/h)74.73 mph (120.26 km/h)
75 mph (120.7 km/h)80.06 mph (128.85 km/h)
80 mph (128.75 km/h)85.4 mph (137.44 km/h)
85 mph (136.79 km/h)90.74 mph (146.03 km/h)
90 mph (144.84 km/h)96.08 mph (154.62 km/h)
95 mph (152.89 km/h)101.41 mph (163.21 km/h)
100 mph (160.93 km/h)106.75 mph (171.8 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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