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 325/65r17 Tire Comparison Side By Side
  265/66-17 325/65-17 Difference
Diameter inches (mm) 30.77 (781.6) 33.63 (854.3) 2.86 (72.7) 9.3%
Width inches (mm) 10.43 (265) 12.8 (325) 2.36 (60) 22.6%
Circum. inches (mm) 96.67 (2455.47) 105.66 (2683.86) 8.99 (228.39) 9.3%
Sidewall Height inches (mm) 6.89 (174.9) 8.32 (211.25) 1.43 (36.35) 20.8%
Revolutions per mile (km) 655.41 (407.25) 599.64 (372.6) -55.77 (-34.66) -8.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.86 mph (35.18 km/h)
25 mph (40.23 km/h)27.33 mph (43.98 km/h)
30 mph (48.28 km/h)32.79 mph (52.77 km/h)
35 mph (56.33 km/h)38.26 mph (61.57 km/h)
40 mph (64.37 km/h)43.72 mph (70.36 km/h)
45 mph (72.42 km/h)49.19 mph (79.16 km/h)
50 mph (80.47 km/h)54.65 mph (87.95 km/h)
55 mph (88.51 km/h)60.12 mph (96.75 km/h)
60 mph (96.56 km/h)65.58 mph (105.54 km/h)
65 mph (104.61 km/h)71.05 mph (114.34 km/h)
70 mph (112.65 km/h)76.51 mph (123.13 km/h)
75 mph (120.7 km/h)81.98 mph (131.93 km/h)
80 mph (128.75 km/h)87.44 mph (140.72 km/h)
85 mph (136.79 km/h)92.91 mph (149.52 km/h)
90 mph (144.84 km/h)98.37 mph (158.31 km/h)
95 mph (152.89 km/h)103.84 mph (167.11 km/h)
100 mph (160.93 km/h)109.3 mph (175.9 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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