Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
235/60r14 vs 255/60r15 Tire Comparison Side By Side
  235/60-14 255/60-15 Difference
Diameter inches (mm) 25.1 (637.6) 27.05 (687) 1.94 (49.4) 7.7%
Width inches (mm) 9.25 (235) 10.04 (255) 0.79 (20) 8.5%
Circum. inches (mm) 78.86 (2003.08) 84.97 (2158.27) 6.11 (155.19) 7.7%
Sidewall Height inches (mm) 5.55 (141) 6.02 (153) 0.47 (12) 8.5%
Revolutions per mile (km) 803.43 (499.23) 745.66 (463.33) -57.77 (-35.9) -7.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.55 mph (34.68 km/h)
25 mph (40.23 km/h)26.94 mph (43.35 km/h)
30 mph (48.28 km/h)32.32 mph (52.02 km/h)
35 mph (56.33 km/h)37.71 mph (60.69 km/h)
40 mph (64.37 km/h)43.1 mph (69.36 km/h)
45 mph (72.42 km/h)48.49 mph (78.03 km/h)
50 mph (80.47 km/h)53.87 mph (86.7 km/h)
55 mph (88.51 km/h)59.26 mph (95.37 km/h)
60 mph (96.56 km/h)64.65 mph (104.04 km/h)
65 mph (104.61 km/h)70.04 mph (112.71 km/h)
70 mph (112.65 km/h)75.42 mph (121.38 km/h)
75 mph (120.7 km/h)80.81 mph (130.05 km/h)
80 mph (128.75 km/h)86.2 mph (138.72 km/h)
85 mph (136.79 km/h)91.59 mph (147.39 km/h)
90 mph (144.84 km/h)96.97 mph (156.06 km/h)
95 mph (152.89 km/h)102.36 mph (164.73 km/h)
100 mph (160.93 km/h)107.75 mph (173.4 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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