Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
255/70r16 vs 255/75r17 Tire Comparison Side By Side
  255/70-16 255/75-17 Difference
Diameter inches (mm) 30.06 (763.4) 32.06 (814.3) 2 (50.9) 6.7%
Width inches (mm) 10.04 (255) 10.04 (255) 0 (0) 0%
Circum. inches (mm) 94.42 (2398.29) 100.72 (2558.2) 6.3 (159.91) 6.7%
Sidewall Height inches (mm) 7.03 (178.5) 7.53 (191.25) 0.5 (12.75) 7.1%
Revolutions per mile (km) 671.04 (416.96) 629.09 (390.9) -41.95 (-26.06) -6.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.33 mph (34.33 km/h)
25 mph (40.23 km/h)26.67 mph (42.92 km/h)
30 mph (48.28 km/h)32 mph (51.5 km/h)
35 mph (56.33 km/h)37.33 mph (60.08 km/h)
40 mph (64.37 km/h)42.67 mph (68.67 km/h)
45 mph (72.42 km/h)48 mph (77.25 km/h)
50 mph (80.47 km/h)53.33 mph (85.83 km/h)
55 mph (88.51 km/h)58.67 mph (94.42 km/h)
60 mph (96.56 km/h)64 mph (103 km/h)
65 mph (104.61 km/h)69.33 mph (111.58 km/h)
70 mph (112.65 km/h)74.67 mph (120.17 km/h)
75 mph (120.7 km/h)80 mph (128.75 km/h)
80 mph (128.75 km/h)85.33 mph (137.33 km/h)
85 mph (136.79 km/h)90.67 mph (145.92 km/h)
90 mph (144.84 km/h)96 mph (154.5 km/h)
95 mph (152.89 km/h)101.33 mph (163.08 km/h)
100 mph (160.93 km/h)106.67 mph (171.67 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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