Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
305/25r21 vs 275/35r19 Tire Comparison Side By Side
  305/25-21 275/35-19 Difference
Diameter inches (mm) 27 (685.9) 26.58 (675.1) -0.43 (-10.8) -1.6%
Width inches (mm) 12.01 (305) 10.83 (275) -1.18 (-30) -9.8%
Circum. inches (mm) 84.84 (2154.82) 83.5 (2120.89) -1.34 (-33.93) -1.6%
Sidewall Height inches (mm) 3 (76.25) 3.79 (96.25) 0.79 (20) 26.2%
Revolutions per mile (km) 746.86 (464.08) 758.81 (471.5) 11.95 (7.42) 1.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.69 mph (31.68 km/h)
25 mph (40.23 km/h)24.61 mph (39.6 km/h)
30 mph (48.28 km/h)29.53 mph (47.52 km/h)
35 mph (56.33 km/h)34.45 mph (55.44 km/h)
40 mph (64.37 km/h)39.37 mph (63.36 km/h)
45 mph (72.42 km/h)44.29 mph (71.28 km/h)
50 mph (80.47 km/h)49.21 mph (79.2 km/h)
55 mph (88.51 km/h)54.13 mph (87.12 km/h)
60 mph (96.56 km/h)59.06 mph (95.04 km/h)
65 mph (104.61 km/h)63.98 mph (102.96 km/h)
70 mph (112.65 km/h)68.9 mph (110.88 km/h)
75 mph (120.7 km/h)73.82 mph (118.8 km/h)
80 mph (128.75 km/h)78.74 mph (126.72 km/h)
85 mph (136.79 km/h)83.66 mph (134.64 km/h)
90 mph (144.84 km/h)88.58 mph (142.56 km/h)
95 mph (152.89 km/h)93.5 mph (150.48 km/h)
100 mph (160.93 km/h)98.43 mph (158.4 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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