Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
235/65r15 vs 255/65r15 Tire Comparison Side By Side
  235/65-15 255/65-15 Difference
Diameter inches (mm) 27.03 (686.5) 28.05 (712.5) 1.02 (26) 3.8%
Width inches (mm) 9.25 (235) 10.04 (255) 0.79 (20) 8.5%
Circum. inches (mm) 84.91 (2156.7) 88.13 (2238.38) 3.22 (81.68) 3.8%
Sidewall Height inches (mm) 6.01 (152.75) 6.53 (165.75) 0.51 (13) 8.5%
Revolutions per mile (km) 746.21 (463.67) 718.98 (446.75) -27.23 (-16.92) -3.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.76 mph (33.41 km/h)
25 mph (40.23 km/h)25.95 mph (41.76 km/h)
30 mph (48.28 km/h)31.14 mph (50.11 km/h)
35 mph (56.33 km/h)36.33 mph (58.46 km/h)
40 mph (64.37 km/h)41.51 mph (66.81 km/h)
45 mph (72.42 km/h)46.7 mph (75.16 km/h)
50 mph (80.47 km/h)51.89 mph (83.51 km/h)
55 mph (88.51 km/h)57.08 mph (91.87 km/h)
60 mph (96.56 km/h)62.27 mph (100.22 km/h)
65 mph (104.61 km/h)67.46 mph (108.57 km/h)
70 mph (112.65 km/h)72.65 mph (116.92 km/h)
75 mph (120.7 km/h)77.84 mph (125.27 km/h)
80 mph (128.75 km/h)83.03 mph (133.62 km/h)
85 mph (136.79 km/h)88.22 mph (141.98 km/h)
90 mph (144.84 km/h)93.41 mph (150.33 km/h)
95 mph (152.89 km/h)98.6 mph (158.68 km/h)
100 mph (160.93 km/h)103.79 mph (167.03 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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