Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
255/75r17 vs 255/85r16 Tire Comparison Side By Side
  255/75-17 255/85-16 Difference
Diameter inches (mm) 32.06 (814.3) 33.07 (839.9) 1.01 (25.6) 3.1%
Width inches (mm) 10.04 (255) 10.04 (255) 0 (0) 0%
Circum. inches (mm) 100.72 (2558.2) 103.88 (2638.62) 3.17 (80.42) 3.1%
Sidewall Height inches (mm) 7.53 (191.25) 8.53 (216.75) 1 (25.5) 13.3%
Revolutions per mile (km) 629.09 (390.9) 609.92 (378.98) -19.17 (-11.91) -3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.63 mph (33.2 km/h)
25 mph (40.23 km/h)25.79 mph (41.5 km/h)
30 mph (48.28 km/h)30.94 mph (49.8 km/h)
35 mph (56.33 km/h)36.1 mph (58.1 km/h)
40 mph (64.37 km/h)41.26 mph (66.4 km/h)
45 mph (72.42 km/h)46.41 mph (74.7 km/h)
50 mph (80.47 km/h)51.57 mph (83 km/h)
55 mph (88.51 km/h)56.73 mph (91.3 km/h)
60 mph (96.56 km/h)61.89 mph (99.6 km/h)
65 mph (104.61 km/h)67.04 mph (107.9 km/h)
70 mph (112.65 km/h)72.2 mph (116.2 km/h)
75 mph (120.7 km/h)77.36 mph (124.5 km/h)
80 mph (128.75 km/h)82.52 mph (132.8 km/h)
85 mph (136.79 km/h)87.67 mph (141.1 km/h)
90 mph (144.84 km/h)92.83 mph (149.39 km/h)
95 mph (152.89 km/h)97.99 mph (157.69 km/h)
100 mph (160.93 km/h)103.14 mph (165.99 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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