Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
305/30r19 vs 275/35r19 Tire Comparison Side By Side
  305/30-19 275/35-19 Difference
Diameter inches (mm) 26.2 (665.6) 26.58 (675.1) 0.37 (9.5) 1.4%
Width inches (mm) 12.01 (305) 10.83 (275) -1.18 (-30) -9.8%
Circum. inches (mm) 82.32 (2091.04) 83.5 (2120.89) 1.18 (29.85) 1.4%
Sidewall Height inches (mm) 3.6 (91.5) 3.79 (96.25) 0.19 (4.75) 5.2%
Revolutions per mile (km) 769.64 (478.23) 758.81 (471.5) -10.83 (-6.73) -1.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.29 mph (32.65 km/h)
25 mph (40.23 km/h)25.36 mph (40.81 km/h)
30 mph (48.28 km/h)30.43 mph (48.97 km/h)
35 mph (56.33 km/h)35.5 mph (57.13 km/h)
40 mph (64.37 km/h)40.57 mph (65.29 km/h)
45 mph (72.42 km/h)45.64 mph (73.45 km/h)
50 mph (80.47 km/h)50.71 mph (81.62 km/h)
55 mph (88.51 km/h)55.79 mph (89.78 km/h)
60 mph (96.56 km/h)60.86 mph (97.94 km/h)
65 mph (104.61 km/h)65.93 mph (106.1 km/h)
70 mph (112.65 km/h)71 mph (114.26 km/h)
75 mph (120.7 km/h)76.07 mph (122.42 km/h)
80 mph (128.75 km/h)81.14 mph (130.59 km/h)
85 mph (136.79 km/h)86.21 mph (138.75 km/h)
90 mph (144.84 km/h)91.28 mph (146.91 km/h)
95 mph (152.89 km/h)96.36 mph (155.07 km/h)
100 mph (160.93 km/h)101.43 mph (163.23 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
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