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 265/85r17 Tire Comparison Side By Side
  265/66-17 265/85-17 Difference
Diameter inches (mm) 30.77 (781.6) 34.74 (882.3) 3.96 (100.7) 12.9%
Width inches (mm) 10.43 (265) 10.43 (265) 0 (0) 0%
Circum. inches (mm) 96.67 (2455.47) 109.13 (2771.83) 12.46 (316.36) 12.9%
Sidewall Height inches (mm) 6.89 (174.9) 8.87 (225.25) 1.98 (50.35) 28.8%
Revolutions per mile (km) 655.41 (407.25) 580.61 (360.77) -74.8 (-46.48) -11.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)22.58 mph (36.33 km/h)
25 mph (40.23 km/h)28.22 mph (45.42 km/h)
30 mph (48.28 km/h)33.87 mph (54.5 km/h)
35 mph (56.33 km/h)39.51 mph (63.58 km/h)
40 mph (64.37 km/h)45.15 mph (72.67 km/h)
45 mph (72.42 km/h)50.8 mph (81.75 km/h)
50 mph (80.47 km/h)56.44 mph (90.83 km/h)
55 mph (88.51 km/h)62.09 mph (99.92 km/h)
60 mph (96.56 km/h)67.73 mph (109 km/h)
65 mph (104.61 km/h)73.37 mph (118.09 km/h)
70 mph (112.65 km/h)79.02 mph (127.17 km/h)
75 mph (120.7 km/h)84.66 mph (136.25 km/h)
80 mph (128.75 km/h)90.31 mph (145.34 km/h)
85 mph (136.79 km/h)95.95 mph (154.42 km/h)
90 mph (144.84 km/h)101.6 mph (163.5 km/h)
95 mph (152.89 km/h)107.24 mph (172.59 km/h)
100 mph (160.93 km/h)112.88 mph (181.67 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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