Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
175/70r15 vs 175/70r14 Tire Comparison Side By Side
  175/70-15 175/70-14 Difference
Diameter inches (mm) 24.65 (626) 23.65 (600.6) -1 (-25.4) -4.1%
Width inches (mm) 6.89 (175) 6.89 (175) 0 (0) 0%
Circum. inches (mm) 77.43 (1966.64) 74.29 (1886.84) -3.14 (-79.8) -4.1%
Sidewall Height inches (mm) 4.82 (122.5) 4.82 (122.5) 0 (0) 0%
Revolutions per mile (km) 818.32 (508.48) 852.93 (529.99) 34.61 (21.5) 4.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.19 mph (30.88 km/h)
25 mph (40.23 km/h)23.99 mph (38.6 km/h)
30 mph (48.28 km/h)28.78 mph (46.32 km/h)
35 mph (56.33 km/h)33.58 mph (54.04 km/h)
40 mph (64.37 km/h)38.38 mph (61.76 km/h)
45 mph (72.42 km/h)43.17 mph (69.48 km/h)
50 mph (80.47 km/h)47.97 mph (77.2 km/h)
55 mph (88.51 km/h)52.77 mph (84.92 km/h)
60 mph (96.56 km/h)57.57 mph (92.64 km/h)
65 mph (104.61 km/h)62.36 mph (100.36 km/h)
70 mph (112.65 km/h)67.16 mph (108.08 km/h)
75 mph (120.7 km/h)71.96 mph (115.8 km/h)
80 mph (128.75 km/h)76.75 mph (123.52 km/h)
85 mph (136.79 km/h)81.55 mph (131.24 km/h)
90 mph (144.84 km/h)86.35 mph (138.96 km/h)
95 mph (152.89 km/h)91.15 mph (146.68 km/h)
100 mph (160.93 km/h)95.94 mph (154.4 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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