Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
275/50r15 vs 245/50r15 Tire Comparison Side By Side
  275/50-15 245/50-15 Difference
Diameter inches (mm) 25.83 (656) 24.65 (626) -1.18 (-30) -4.6%
Width inches (mm) 10.83 (275) 9.65 (245) -1.18 (-30) -10.9%
Circum. inches (mm) 81.14 (2060.88) 77.43 (1966.64) -3.71 (-94.25) -4.6%
Sidewall Height inches (mm) 5.41 (137.5) 4.82 (122.5) -0.59 (-15) -10.9%
Revolutions per mile (km) 780.9 (485.23) 818.32 (508.48) 37.42 (23.25) 4.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.09 mph (30.71 km/h)
25 mph (40.23 km/h)23.86 mph (38.39 km/h)
30 mph (48.28 km/h)28.63 mph (46.07 km/h)
35 mph (56.33 km/h)33.4 mph (53.75 km/h)
40 mph (64.37 km/h)38.17 mph (61.43 km/h)
45 mph (72.42 km/h)42.94 mph (69.11 km/h)
50 mph (80.47 km/h)47.71 mph (76.79 km/h)
55 mph (88.51 km/h)52.48 mph (84.47 km/h)
60 mph (96.56 km/h)57.26 mph (92.14 km/h)
65 mph (104.61 km/h)62.03 mph (99.82 km/h)
70 mph (112.65 km/h)66.8 mph (107.5 km/h)
75 mph (120.7 km/h)71.57 mph (115.18 km/h)
80 mph (128.75 km/h)76.34 mph (122.86 km/h)
85 mph (136.79 km/h)81.11 mph (130.54 km/h)
90 mph (144.84 km/h)85.88 mph (138.22 km/h)
95 mph (152.89 km/h)90.66 mph (145.9 km/h)
100 mph (160.93 km/h)95.43 mph (153.57 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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