Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
255/60r17 vs 285/70r17 Tire Comparison Side By Side
  255/60-17 285/70-17 Difference
Diameter inches (mm) 29.05 (737.8) 32.71 (830.8) 3.66 (93) 12.6%
Width inches (mm) 10.04 (255) 11.22 (285) 1.18 (30) 11.8%
Circum. inches (mm) 91.25 (2317.87) 102.76 (2610.04) 11.5 (292.17) 12.6%
Sidewall Height inches (mm) 6.02 (153) 7.85 (199.5) 1.83 (46.5) 30.4%
Revolutions per mile (km) 694.32 (431.43) 616.6 (383.14) -77.72 (-48.29) -11.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)22.52 mph (36.24 km/h)
25 mph (40.23 km/h)28.15 mph (45.31 km/h)
30 mph (48.28 km/h)33.78 mph (54.37 km/h)
35 mph (56.33 km/h)39.41 mph (63.43 km/h)
40 mph (64.37 km/h)45.04 mph (72.49 km/h)
45 mph (72.42 km/h)50.67 mph (81.55 km/h)
50 mph (80.47 km/h)56.3 mph (90.61 km/h)
55 mph (88.51 km/h)61.93 mph (99.67 km/h)
60 mph (96.56 km/h)67.56 mph (108.73 km/h)
65 mph (104.61 km/h)73.19 mph (117.79 km/h)
70 mph (112.65 km/h)78.82 mph (126.85 km/h)
75 mph (120.7 km/h)84.45 mph (135.92 km/h)
80 mph (128.75 km/h)90.08 mph (144.98 km/h)
85 mph (136.79 km/h)95.71 mph (154.04 km/h)
90 mph (144.84 km/h)101.34 mph (163.1 km/h)
95 mph (152.89 km/h)106.97 mph (172.16 km/h)
100 mph (160.93 km/h)112.61 mph (181.22 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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