Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
225/60r15 vs 255/60r15 Tire Comparison Side By Side
  225/60-15 255/60-15 Difference
Diameter inches (mm) 25.63 (651) 27.05 (687) 1.42 (36) 5.5%
Width inches (mm) 8.86 (225) 10.04 (255) 1.18 (30) 13.3%
Circum. inches (mm) 80.52 (2045.18) 84.97 (2158.27) 4.45 (113.1) 5.5%
Sidewall Height inches (mm) 5.31 (135) 6.02 (153) 0.71 (18) 13.3%
Revolutions per mile (km) 786.9 (488.95) 745.66 (463.33) -41.23 (-25.62) -5.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.11 mph (33.97 km/h)
25 mph (40.23 km/h)26.38 mph (42.46 km/h)
30 mph (48.28 km/h)31.66 mph (50.95 km/h)
35 mph (56.33 km/h)36.94 mph (59.44 km/h)
40 mph (64.37 km/h)42.21 mph (67.93 km/h)
45 mph (72.42 km/h)47.49 mph (76.43 km/h)
50 mph (80.47 km/h)52.76 mph (84.92 km/h)
55 mph (88.51 km/h)58.04 mph (93.41 km/h)
60 mph (96.56 km/h)63.32 mph (101.9 km/h)
65 mph (104.61 km/h)68.59 mph (110.39 km/h)
70 mph (112.65 km/h)73.87 mph (118.88 km/h)
75 mph (120.7 km/h)79.15 mph (127.38 km/h)
80 mph (128.75 km/h)84.42 mph (135.87 km/h)
85 mph (136.79 km/h)89.7 mph (144.36 km/h)
90 mph (144.84 km/h)94.98 mph (152.85 km/h)
95 mph (152.89 km/h)100.25 mph (161.34 km/h)
100 mph (160.93 km/h)105.53 mph (169.83 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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