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 265/70r17 Tire Comparison Side By Side
  265/66-17 265/70-17 Difference
Diameter inches (mm) 30.77 (781.6) 31.61 (802.8) 0.83 (21.2) 2.7%
Width inches (mm) 10.43 (265) 10.43 (265) 0 (0) 0%
Circum. inches (mm) 96.67 (2455.47) 99.29 (2522.07) 2.62 (66.6) 2.7%
Sidewall Height inches (mm) 6.89 (174.9) 7.3 (185.5) 0.42 (10.6) 6.1%
Revolutions per mile (km) 655.41 (407.25) 638.1 (396.5) -17.31 (-10.75) -2.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.54 mph (33.06 km/h)
25 mph (40.23 km/h)25.68 mph (41.32 km/h)
30 mph (48.28 km/h)30.81 mph (49.59 km/h)
35 mph (56.33 km/h)35.95 mph (57.85 km/h)
40 mph (64.37 km/h)41.08 mph (66.12 km/h)
45 mph (72.42 km/h)46.22 mph (74.38 km/h)
50 mph (80.47 km/h)51.36 mph (82.65 km/h)
55 mph (88.51 km/h)56.49 mph (90.91 km/h)
60 mph (96.56 km/h)61.63 mph (99.18 km/h)
65 mph (104.61 km/h)66.76 mph (107.44 km/h)
70 mph (112.65 km/h)71.9 mph (115.71 km/h)
75 mph (120.7 km/h)77.03 mph (123.97 km/h)
80 mph (128.75 km/h)82.17 mph (132.24 km/h)
85 mph (136.79 km/h)87.31 mph (140.5 km/h)
90 mph (144.84 km/h)92.44 mph (148.77 km/h)
95 mph (152.89 km/h)97.58 mph (157.03 km/h)
100 mph (160.93 km/h)102.71 mph (165.3 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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