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 265/65r17 Tire Comparison Side By Side
  265/66-17 265/65-17 Difference
Diameter inches (mm) 30.77 (781.6) 30.56 (776.3) -0.21 (-5.3) -0.7%
Width inches (mm) 10.43 (265) 10.43 (265) 0 (0) 0%
Circum. inches (mm) 96.67 (2455.47) 96.02 (2438.82) -0.66 (-16.65) -0.7%
Sidewall Height inches (mm) 6.89 (174.9) 6.78 (172.25) -0.1 (-2.65) -1.5%
Revolutions per mile (km) 655.41 (407.25) 659.89 (410.03) 4.47 (2.78) 0.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.86 mph (31.97 km/h)
25 mph (40.23 km/h)24.83 mph (39.96 km/h)
30 mph (48.28 km/h)29.8 mph (47.95 km/h)
35 mph (56.33 km/h)34.76 mph (55.95 km/h)
40 mph (64.37 km/h)39.73 mph (63.94 km/h)
45 mph (72.42 km/h)44.69 mph (71.93 km/h)
50 mph (80.47 km/h)49.66 mph (79.92 km/h)
55 mph (88.51 km/h)54.63 mph (87.91 km/h)
60 mph (96.56 km/h)59.59 mph (95.91 km/h)
65 mph (104.61 km/h)64.56 mph (103.9 km/h)
70 mph (112.65 km/h)69.53 mph (111.89 km/h)
75 mph (120.7 km/h)74.49 mph (119.88 km/h)
80 mph (128.75 km/h)79.46 mph (127.87 km/h)
85 mph (136.79 km/h)84.42 mph (135.87 km/h)
90 mph (144.84 km/h)89.39 mph (143.86 km/h)
95 mph (152.89 km/h)94.36 mph (151.85 km/h)
100 mph (160.93 km/h)99.32 mph (159.84 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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