Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
245/70r17 vs 245/75r17 Tire Comparison Side By Side
  245/70-17 245/75-17 Difference
Diameter inches (mm) 30.5 (774.8) 31.47 (799.3) 0.96 (24.5) 3.2%
Width inches (mm) 9.65 (245) 9.65 (245) 0 (0) 0%
Circum. inches (mm) 95.83 (2434.11) 98.86 (2511.08) 3.03 (76.97) 3.2%
Sidewall Height inches (mm) 6.75 (171.5) 7.23 (183.75) 0.48 (12.25) 7.1%
Revolutions per mile (km) 661.16 (410.83) 640.9 (398.24) -20.27 (-12.59) -3.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.63 mph (33.2 km/h)
25 mph (40.23 km/h)25.79 mph (41.51 km/h)
30 mph (48.28 km/h)30.95 mph (49.81 km/h)
35 mph (56.33 km/h)36.11 mph (58.11 km/h)
40 mph (64.37 km/h)41.26 mph (66.41 km/h)
45 mph (72.42 km/h)46.42 mph (74.71 km/h)
50 mph (80.47 km/h)51.58 mph (83.01 km/h)
55 mph (88.51 km/h)56.74 mph (91.31 km/h)
60 mph (96.56 km/h)61.9 mph (99.61 km/h)
65 mph (104.61 km/h)67.06 mph (107.92 km/h)
70 mph (112.65 km/h)72.21 mph (116.22 km/h)
75 mph (120.7 km/h)77.37 mph (124.52 km/h)
80 mph (128.75 km/h)82.53 mph (132.82 km/h)
85 mph (136.79 km/h)87.69 mph (141.12 km/h)
90 mph (144.84 km/h)92.85 mph (149.42 km/h)
95 mph (152.89 km/h)98 mph (157.72 km/h)
100 mph (160.93 km/h)103.16 mph (166.02 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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