Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
180/60r15 vs 175/65r14 Tire Comparison Side By Side
  180/60-15 175/65-14 Difference
Diameter inches (mm) 23.5 (597) 22.96 (583.1) -0.55 (-13.9) -2.3%
Width inches (mm) 7.09 (180) 6.89 (175) -0.2 (-5) -2.8%
Circum. inches (mm) 73.84 (1875.53) 72.12 (1831.86) -1.72 (-43.67) -2.3%
Sidewall Height inches (mm) 4.25 (108) 4.48 (113.75) 0.23 (5.75) 5.3%
Revolutions per mile (km) 858.07 (533.18) 878.53 (545.89) 20.45 (12.71) 2.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.53 mph (31.44 km/h)
25 mph (40.23 km/h)24.42 mph (39.3 km/h)
30 mph (48.28 km/h)29.3 mph (47.16 km/h)
35 mph (56.33 km/h)34.19 mph (55.02 km/h)
40 mph (64.37 km/h)39.07 mph (62.88 km/h)
45 mph (72.42 km/h)43.95 mph (70.73 km/h)
50 mph (80.47 km/h)48.84 mph (78.59 km/h)
55 mph (88.51 km/h)53.72 mph (86.45 km/h)
60 mph (96.56 km/h)58.6 mph (94.31 km/h)
65 mph (104.61 km/h)63.49 mph (102.17 km/h)
70 mph (112.65 km/h)68.37 mph (110.03 km/h)
75 mph (120.7 km/h)73.25 mph (117.89 km/h)
80 mph (128.75 km/h)78.14 mph (125.75 km/h)
85 mph (136.79 km/h)83.02 mph (133.61 km/h)
90 mph (144.84 km/h)87.9 mph (141.47 km/h)
95 mph (152.89 km/h)92.79 mph (149.33 km/h)
100 mph (160.93 km/h)97.67 mph (157.19 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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