Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
245/85r16 vs 265/70r16 Tire Comparison Side By Side
  245/85-16 265/70-16 Difference
Diameter inches (mm) 32.4 (822.9) 30.61 (777.4) -1.79 (-45.5) -5.5%
Width inches (mm) 9.65 (245) 10.43 (265) 0.79 (20) 8.2%
Circum. inches (mm) 101.78 (2585.22) 96.15 (2442.27) -5.63 (-142.94) -5.5%
Sidewall Height inches (mm) 8.2 (208.25) 7.3 (185.5) -0.9 (-22.75) -10.9%
Revolutions per mile (km) 622.52 (386.81) 658.95 (409.45) 36.44 (22.64) 5.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.89 mph (30.41 km/h)
25 mph (40.23 km/h)23.62 mph (38.01 km/h)
30 mph (48.28 km/h)28.34 mph (45.61 km/h)
35 mph (56.33 km/h)33.06 mph (53.21 km/h)
40 mph (64.37 km/h)37.79 mph (60.81 km/h)
45 mph (72.42 km/h)42.51 mph (68.42 km/h)
50 mph (80.47 km/h)47.24 mph (76.02 km/h)
55 mph (88.51 km/h)51.96 mph (83.62 km/h)
60 mph (96.56 km/h)56.68 mph (91.22 km/h)
65 mph (104.61 km/h)61.41 mph (98.82 km/h)
70 mph (112.65 km/h)66.13 mph (106.43 km/h)
75 mph (120.7 km/h)70.85 mph (114.03 km/h)
80 mph (128.75 km/h)75.58 mph (121.63 km/h)
85 mph (136.79 km/h)80.3 mph (129.23 km/h)
90 mph (144.84 km/h)85.02 mph (136.83 km/h)
95 mph (152.89 km/h)89.75 mph (144.43 km/h)
100 mph (160.93 km/h)94.47 mph (152.04 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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