Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
185/55r15 vs 195/45r15 Tire Comparison Side By Side
  185/55-15 195/45-15 Difference
Diameter inches (mm) 23.01 (584.5) 21.91 (556.5) -1.1 (-28) -4.8%
Width inches (mm) 7.28 (185) 7.68 (195) 0.39 (10) 5.4%
Circum. inches (mm) 72.29 (1836.26) 68.83 (1748.3) -3.46 (-87.96) -4.8%
Sidewall Height inches (mm) 4.01 (101.75) 3.45 (87.75) -0.55 (-14) -13.8%
Revolutions per mile (km) 876.42 (544.58) 920.52 (571.98) 44.1 (27.4) 5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.04 mph (30.65 km/h)
25 mph (40.23 km/h)23.8 mph (38.31 km/h)
30 mph (48.28 km/h)28.56 mph (45.97 km/h)
35 mph (56.33 km/h)33.32 mph (53.63 km/h)
40 mph (64.37 km/h)38.08 mph (61.29 km/h)
45 mph (72.42 km/h)42.84 mph (68.95 km/h)
50 mph (80.47 km/h)47.6 mph (76.61 km/h)
55 mph (88.51 km/h)52.37 mph (84.27 km/h)
60 mph (96.56 km/h)57.13 mph (91.94 km/h)
65 mph (104.61 km/h)61.89 mph (99.6 km/h)
70 mph (112.65 km/h)66.65 mph (107.26 km/h)
75 mph (120.7 km/h)71.41 mph (114.92 km/h)
80 mph (128.75 km/h)76.17 mph (122.58 km/h)
85 mph (136.79 km/h)80.93 mph (130.24 km/h)
90 mph (144.84 km/h)85.69 mph (137.9 km/h)
95 mph (152.89 km/h)90.45 mph (145.56 km/h)
100 mph (160.93 km/h)95.21 mph (153.23 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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