Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
255/35r18 vs 255/60r15 Tire Comparison Side By Side
  255/35-18 255/60-15 Difference
Diameter inches (mm) 25.03 (635.7) 27.05 (687) 2.02 (51.3) 8.1%
Width inches (mm) 10.04 (255) 10.04 (255) 0 (0) 0%
Circum. inches (mm) 78.63 (1997.11) 84.97 (2158.27) 6.35 (161.16) 8.1%
Sidewall Height inches (mm) 3.51 (89.25) 6.02 (153) 2.51 (63.75) 71.4%
Revolutions per mile (km) 805.84 (500.72) 745.66 (463.33) -60.17 (-37.39) -7.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.61 mph (34.78 km/h)
25 mph (40.23 km/h)27.02 mph (43.48 km/h)
30 mph (48.28 km/h)32.42 mph (52.18 km/h)
35 mph (56.33 km/h)37.82 mph (60.87 km/h)
40 mph (64.37 km/h)43.23 mph (69.57 km/h)
45 mph (72.42 km/h)48.63 mph (78.26 km/h)
50 mph (80.47 km/h)54.03 mph (86.96 km/h)
55 mph (88.51 km/h)59.44 mph (95.66 km/h)
60 mph (96.56 km/h)64.84 mph (104.35 km/h)
65 mph (104.61 km/h)70.25 mph (113.05 km/h)
70 mph (112.65 km/h)75.65 mph (121.75 km/h)
75 mph (120.7 km/h)81.05 mph (130.44 km/h)
80 mph (128.75 km/h)86.46 mph (139.14 km/h)
85 mph (136.79 km/h)91.86 mph (147.83 km/h)
90 mph (144.84 km/h)97.26 mph (156.53 km/h)
95 mph (152.89 km/h)102.67 mph (165.23 km/h)
100 mph (160.93 km/h)108.07 mph (173.92 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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