Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
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175/90r18 vs 290/70r18 Tire Comparison Side By Side
  175/90-18 290/70-18 Difference
Diameter inches (mm) 30.4 (772.2) 33.98 (863.2) 3.58 (91) 11.8%
Width inches (mm) 6.89 (175) 11.42 (290) 4.53 (115) 65.7%
Circum. inches (mm) 95.51 (2425.94) 106.76 (2711.82) 11.26 (285.88) 11.8%
Sidewall Height inches (mm) 6.2 (157.5) 7.99 (203) 1.79 (45.5) 28.9%
Revolutions per mile (km) 663.39 (412.21) 593.45 (368.75) -69.94 (-43.46) -10.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)22.36 mph (35.98 km/h)
25 mph (40.23 km/h)27.95 mph (44.98 km/h)
30 mph (48.28 km/h)33.54 mph (53.97 km/h)
35 mph (56.33 km/h)39.12 mph (62.97 km/h)
40 mph (64.37 km/h)44.71 mph (71.96 km/h)
45 mph (72.42 km/h)50.3 mph (80.96 km/h)
50 mph (80.47 km/h)55.89 mph (89.95 km/h)
55 mph (88.51 km/h)61.48 mph (98.95 km/h)
60 mph (96.56 km/h)67.07 mph (107.94 km/h)
65 mph (104.61 km/h)72.66 mph (116.94 km/h)
70 mph (112.65 km/h)78.25 mph (125.93 km/h)
75 mph (120.7 km/h)83.84 mph (134.93 km/h)
80 mph (128.75 km/h)89.43 mph (143.92 km/h)
85 mph (136.79 km/h)95.02 mph (152.92 km/h)
90 mph (144.84 km/h)100.61 mph (161.91 km/h)
95 mph (152.89 km/h)106.2 mph (170.91 km/h)
100 mph (160.93 km/h)111.78 mph (179.9 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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