Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
165/65r14 vs 175/75r14 Tire Comparison Side By Side
  165/65-14 175/75-14 Difference
Diameter inches (mm) 22.44 (570.1) 24.33 (618.1) 1.89 (48) 8.4%
Width inches (mm) 6.5 (165) 6.89 (175) 0.39 (10) 6.1%
Circum. inches (mm) 70.51 (1791.02) 76.45 (1941.82) 5.94 (150.8) 8.4%
Sidewall Height inches (mm) 4.22 (107.25) 5.17 (131.25) 0.94 (24) 22.4%
Revolutions per mile (km) 898.56 (558.34) 828.78 (514.98) -69.78 (-43.36) -7.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.68 mph (34.9 km/h)
25 mph (40.23 km/h)27.1 mph (43.62 km/h)
30 mph (48.28 km/h)32.53 mph (52.35 km/h)
35 mph (56.33 km/h)37.95 mph (61.07 km/h)
40 mph (64.37 km/h)43.37 mph (69.79 km/h)
45 mph (72.42 km/h)48.79 mph (78.52 km/h)
50 mph (80.47 km/h)54.21 mph (87.24 km/h)
55 mph (88.51 km/h)59.63 mph (95.97 km/h)
60 mph (96.56 km/h)65.05 mph (104.69 km/h)
65 mph (104.61 km/h)70.47 mph (113.42 km/h)
70 mph (112.65 km/h)75.89 mph (122.14 km/h)
75 mph (120.7 km/h)81.31 mph (130.86 km/h)
80 mph (128.75 km/h)86.74 mph (139.59 km/h)
85 mph (136.79 km/h)92.16 mph (148.31 km/h)
90 mph (144.84 km/h)97.58 mph (157.04 km/h)
95 mph (152.89 km/h)103 mph (165.76 km/h)
100 mph (160.93 km/h)108.42 mph (174.48 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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