Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
175/75r16 vs 175/70r16 Tire Comparison Side By Side
  175/75-16 175/70-16 Difference
Diameter inches (mm) 26.33 (668.9) 25.65 (651.4) -0.69 (-17.5) -2.6%
Width inches (mm) 6.89 (175) 6.89 (175) 0 (0) 0%
Circum. inches (mm) 82.73 (2101.41) 80.57 (2046.43) -2.16 (-54.98) -2.6%
Sidewall Height inches (mm) 5.17 (131.25) 4.82 (122.5) -0.34 (-8.75) -6.7%
Revolutions per mile (km) 765.84 (475.87) 786.41 (488.65) 20.57 (12.78) 2.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.48 mph (31.34 km/h)
25 mph (40.23 km/h)24.35 mph (39.18 km/h)
30 mph (48.28 km/h)29.22 mph (47.02 km/h)
35 mph (56.33 km/h)34.08 mph (54.85 km/h)
40 mph (64.37 km/h)38.95 mph (62.69 km/h)
45 mph (72.42 km/h)43.82 mph (70.53 km/h)
50 mph (80.47 km/h)48.69 mph (78.36 km/h)
55 mph (88.51 km/h)53.56 mph (86.2 km/h)
60 mph (96.56 km/h)58.43 mph (94.03 km/h)
65 mph (104.61 km/h)63.3 mph (101.87 km/h)
70 mph (112.65 km/h)68.17 mph (109.71 km/h)
75 mph (120.7 km/h)73.04 mph (117.54 km/h)
80 mph (128.75 km/h)77.91 mph (125.38 km/h)
85 mph (136.79 km/h)82.78 mph (133.22 km/h)
90 mph (144.84 km/h)87.65 mph (141.05 km/h)
95 mph (152.89 km/h)92.51 mph (148.89 km/h)
100 mph (160.93 km/h)97.38 mph (156.72 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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