Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
265/66r17 vs 325/55r15 Tire Comparison Side By Side
  265/66-17 325/55-15 Difference
Diameter inches (mm) 30.77 (781.6) 29.07 (738.5) -1.7 (-43.1) -5.5%
Width inches (mm) 10.43 (265) 12.8 (325) 2.36 (60) 22.6%
Circum. inches (mm) 96.67 (2455.47) 91.34 (2320.07) -5.33 (-135.4) -5.5%
Sidewall Height inches (mm) 6.89 (174.9) 7.04 (178.75) 0.15 (3.85) 2.2%
Revolutions per mile (km) 655.41 (407.25) 693.66 (431.02) 38.25 (23.77) 5.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.9 mph (30.41 km/h)
25 mph (40.23 km/h)23.62 mph (38.02 km/h)
30 mph (48.28 km/h)28.35 mph (45.62 km/h)
35 mph (56.33 km/h)33.07 mph (53.22 km/h)
40 mph (64.37 km/h)37.79 mph (60.82 km/h)
45 mph (72.42 km/h)42.52 mph (68.43 km/h)
50 mph (80.47 km/h)47.24 mph (76.03 km/h)
55 mph (88.51 km/h)51.97 mph (83.63 km/h)
60 mph (96.56 km/h)56.69 mph (91.24 km/h)
65 mph (104.61 km/h)61.42 mph (98.84 km/h)
70 mph (112.65 km/h)66.14 mph (106.44 km/h)
75 mph (120.7 km/h)70.86 mph (114.05 km/h)
80 mph (128.75 km/h)75.59 mph (121.65 km/h)
85 mph (136.79 km/h)80.31 mph (129.25 km/h)
90 mph (144.84 km/h)85.04 mph (136.85 km/h)
95 mph (152.89 km/h)89.76 mph (144.46 km/h)
100 mph (160.93 km/h)94.49 mph (152.06 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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