Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
255/35r17 vs 225/45r17 Tire Comparison Side By Side
  255/35-17 225/45-17 Difference
Diameter inches (mm) 24.03 (610.3) 24.97 (634.3) 0.94 (24) 3.9%
Width inches (mm) 10.04 (255) 8.86 (225) -1.18 (-30) -11.8%
Circum. inches (mm) 75.48 (1917.31) 78.45 (1992.71) 2.97 (75.4) 3.9%
Sidewall Height inches (mm) 3.51 (89.25) 3.99 (101.25) 0.47 (12) 13.4%
Revolutions per mile (km) 839.37 (521.56) 807.61 (501.83) -31.76 (-19.73) -3.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.79 mph (33.45 km/h)
25 mph (40.23 km/h)25.98 mph (41.82 km/h)
30 mph (48.28 km/h)31.18 mph (50.18 km/h)
35 mph (56.33 km/h)36.38 mph (58.54 km/h)
40 mph (64.37 km/h)41.57 mph (66.91 km/h)
45 mph (72.42 km/h)46.77 mph (75.27 km/h)
50 mph (80.47 km/h)51.97 mph (83.63 km/h)
55 mph (88.51 km/h)57.16 mph (91.99 km/h)
60 mph (96.56 km/h)62.36 mph (100.36 km/h)
65 mph (104.61 km/h)67.56 mph (108.72 km/h)
70 mph (112.65 km/h)72.75 mph (117.08 km/h)
75 mph (120.7 km/h)77.95 mph (125.45 km/h)
80 mph (128.75 km/h)83.15 mph (133.81 km/h)
85 mph (136.79 km/h)88.34 mph (142.17 km/h)
90 mph (144.84 km/h)93.54 mph (150.54 km/h)
95 mph (152.89 km/h)98.74 mph (158.9 km/h)
100 mph (160.93 km/h)103.93 mph (167.26 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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