Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
175/70r14 vs 170/65r14 Tire Comparison Side By Side
  175/70-14 170/65-14 Difference
Diameter inches (mm) 23.65 (600.6) 22.7 (576.6) -0.94 (-24) -4%
Width inches (mm) 6.89 (175) 6.69 (170) -0.2 (-5) -2.9%
Circum. inches (mm) 74.29 (1886.84) 71.32 (1811.44) -2.97 (-75.4) -4%
Sidewall Height inches (mm) 4.82 (122.5) 4.35 (110.5) -0.47 (-12) -9.8%
Revolutions per mile (km) 852.93 (529.99) 888.43 (552.05) 35.5 (22.06) 4.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.2 mph (30.9 km/h)
25 mph (40.23 km/h)24 mph (38.63 km/h)
30 mph (48.28 km/h)28.8 mph (46.35 km/h)
35 mph (56.33 km/h)33.6 mph (54.08 km/h)
40 mph (64.37 km/h)38.4 mph (61.8 km/h)
45 mph (72.42 km/h)43.2 mph (69.53 km/h)
50 mph (80.47 km/h)48 mph (77.25 km/h)
55 mph (88.51 km/h)52.8 mph (84.98 km/h)
60 mph (96.56 km/h)57.6 mph (92.7 km/h)
65 mph (104.61 km/h)62.4 mph (100.43 km/h)
70 mph (112.65 km/h)67.2 mph (108.15 km/h)
75 mph (120.7 km/h)72 mph (115.88 km/h)
80 mph (128.75 km/h)76.8 mph (123.6 km/h)
85 mph (136.79 km/h)81.6 mph (131.33 km/h)
90 mph (144.84 km/h)86.4 mph (139.05 km/h)
95 mph (152.89 km/h)91.2 mph (146.78 km/h)
100 mph (160.93 km/h)96 mph (154.5 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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