Mike "Wuzzy121". Rest in peace, brother

Tire Size Calculator

Tire Size Finder (optional):

Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
285/70r17 vs 285/65r18 Tire Comparison Side By Side
  285/70-17 285/65-18 Difference
Diameter inches (mm) 32.71 (830.8) 32.59 (827.7) -0.12 (-3.1) -0.4%
Width inches (mm) 11.22 (285) 11.22 (285) 0 (0) 0%
Circum. inches (mm) 102.76 (2610.04) 102.37 (2600.3) -0.38 (-9.74) -0.4%
Sidewall Height inches (mm) 7.85 (199.5) 7.29 (185.25) -0.56 (-14.25) -7.1%
Revolutions per mile (km) 616.6 (383.14) 618.91 (384.57) 2.31 (1.43) 0.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.93 mph (32.07 km/h)
25 mph (40.23 km/h)24.91 mph (40.08 km/h)
30 mph (48.28 km/h)29.89 mph (48.1 km/h)
35 mph (56.33 km/h)34.87 mph (56.12 km/h)
40 mph (64.37 km/h)39.85 mph (64.13 km/h)
45 mph (72.42 km/h)44.83 mph (72.15 km/h)
50 mph (80.47 km/h)49.81 mph (80.17 km/h)
55 mph (88.51 km/h)54.79 mph (88.18 km/h)
60 mph (96.56 km/h)59.78 mph (96.2 km/h)
65 mph (104.61 km/h)64.76 mph (104.22 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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