Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
185/45r15 vs 185/35r16 Tire Comparison Side By Side
  185/45-15 185/35-16 Difference
Diameter inches (mm) 21.56 (547.5) 21.1 (535.9) -0.46 (-11.6) -2.1%
Width inches (mm) 7.28 (185) 7.28 (185) 0 (0) 0%
Circum. inches (mm) 67.72 (1720.02) 66.28 (1683.58) -1.43 (-36.44) -2.1%
Sidewall Height inches (mm) 3.28 (83.25) 2.55 (64.75) -0.73 (-18.5) -22.2%
Revolutions per mile (km) 935.65 (581.39) 955.91 (593.97) 20.25 (12.58) 2.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.58 mph (31.5 km/h)
25 mph (40.23 km/h)24.47 mph (39.38 km/h)
30 mph (48.28 km/h)29.36 mph (47.26 km/h)
35 mph (56.33 km/h)34.26 mph (55.13 km/h)
40 mph (64.37 km/h)39.15 mph (63.01 km/h)
45 mph (72.42 km/h)44.05 mph (70.89 km/h)
50 mph (80.47 km/h)48.94 mph (78.76 km/h)
55 mph (88.51 km/h)53.83 mph (86.64 km/h)
60 mph (96.56 km/h)58.73 mph (94.51 km/h)
65 mph (104.61 km/h)63.62 mph (102.39 km/h)
70 mph (112.65 km/h)68.52 mph (110.27 km/h)
75 mph (120.7 km/h)73.41 mph (118.14 km/h)
80 mph (128.75 km/h)78.31 mph (126.02 km/h)
85 mph (136.79 km/h)83.2 mph (133.9 km/h)
90 mph (144.84 km/h)88.09 mph (141.77 km/h)
95 mph (152.89 km/h)92.99 mph (149.65 km/h)
100 mph (160.93 km/h)97.88 mph (157.52 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
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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