Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
285/60r17 vs 33/12.5r17 Tire Comparison Side By Side
  285/60-17 33/12.5-17 Difference
Diameter inches (mm) 30.46 (773.8) 33.03 (838.84) 2.56 (65.04) 8.4%
Width inches (mm) 11.22 (285) 12.52 (318) 1.3 (33) 11.6%
Circum. inches (mm) 95.71 (2430.96) 103.75 (2635.29) 8.04 (204.33) 8.4%
Sidewall Height inches (mm) 6.73 (171) 8.01 (203.52) 1.28 (32.52) 19%
Revolutions per mile (km) 662.02 (411.36) 610.69 (379.46) -51.33 (-31.89) -7.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.68 mph (34.89 km/h)
25 mph (40.23 km/h)27.1 mph (43.62 km/h)
30 mph (48.28 km/h)32.52 mph (52.34 km/h)
35 mph (56.33 km/h)37.94 mph (61.06 km/h)
40 mph (64.37 km/h)43.36 mph (69.78 km/h)
45 mph (72.42 km/h)48.78 mph (78.51 km/h)
50 mph (80.47 km/h)54.2 mph (87.23 km/h)
55 mph (88.51 km/h)59.62 mph (95.95 km/h)
60 mph (96.56 km/h)65.04 mph (104.68 km/h)
65 mph (104.61 km/h)70.46 mph (113.4 km/h)
70 mph (112.65 km/h)75.88 mph (122.12 km/h)
75 mph (120.7 km/h)81.3 mph (130.85 km/h)
80 mph (128.75 km/h)86.72 mph (139.57 km/h)
85 mph (136.79 km/h)92.14 mph (148.29 km/h)
90 mph (144.84 km/h)97.56 mph (157.02 km/h)
95 mph (152.89 km/h)102.99 mph (165.74 km/h)
100 mph (160.93 km/h)108.41 mph (174.46 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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