Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
170/80r16 vs 140/80r15 Tire Comparison Side By Side
  170/80-16 140/80-15 Difference
Diameter inches (mm) 26.71 (678.4) 23.82 (605) -2.89 (-73.4) -10.8%
Width inches (mm) 6.69 (170) 5.51 (140) -1.18 (-30) -17.6%
Circum. inches (mm) 83.91 (2131.26) 74.83 (1900.66) -9.08 (-230.59) -10.8%
Sidewall Height inches (mm) 5.35 (136) 4.41 (112) -0.94 (-24) -17.6%
Revolutions per mile (km) 755.12 (469.21) 846.73 (526.13) 91.61 (56.93) 12.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)17.84 mph (28.7 km/h)
25 mph (40.23 km/h)22.3 mph (35.88 km/h)
30 mph (48.28 km/h)26.75 mph (43.06 km/h)
35 mph (56.33 km/h)31.21 mph (50.23 km/h)
40 mph (64.37 km/h)35.67 mph (57.41 km/h)
45 mph (72.42 km/h)40.13 mph (64.59 km/h)
50 mph (80.47 km/h)44.59 mph (71.76 km/h)
55 mph (88.51 km/h)49.05 mph (78.94 km/h)
60 mph (96.56 km/h)53.51 mph (86.11 km/h)
65 mph (104.61 km/h)57.97 mph (93.29 km/h)
70 mph (112.65 km/h)62.43 mph (100.47 km/h)
75 mph (120.7 km/h)66.89 mph (107.64 km/h)
80 mph (128.75 km/h)71.34 mph (114.82 km/h)
85 mph (136.79 km/h)75.8 mph (121.99 km/h)
90 mph (144.84 km/h)80.26 mph (129.17 km/h)
95 mph (152.89 km/h)84.72 mph (136.35 km/h)
100 mph (160.93 km/h)89.18 mph (143.52 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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