Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
235/55r19 vs 255/55r19 Tire Comparison Side By Side
  235/55-19 255/55-19 Difference
Diameter inches (mm) 29.18 (741.1) 30.04 (763.1) 0.87 (22) 3%
Width inches (mm) 9.25 (235) 10.04 (255) 0.79 (20) 8.5%
Circum. inches (mm) 91.66 (2328.23) 94.38 (2397.35) 2.72 (69.12) 3%
Sidewall Height inches (mm) 5.09 (129.25) 5.52 (140.25) 0.43 (11) 8.5%
Revolutions per mile (km) 691.23 (429.51) 671.3 (417.13) -19.93 (-12.38) -2.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.59 mph (33.14 km/h)
25 mph (40.23 km/h)25.74 mph (41.43 km/h)
30 mph (48.28 km/h)30.89 mph (49.71 km/h)
35 mph (56.33 km/h)36.04 mph (58 km/h)
40 mph (64.37 km/h)41.19 mph (66.28 km/h)
45 mph (72.42 km/h)46.34 mph (74.57 km/h)
50 mph (80.47 km/h)51.48 mph (82.86 km/h)
55 mph (88.51 km/h)56.63 mph (91.14 km/h)
60 mph (96.56 km/h)61.78 mph (99.43 km/h)
65 mph (104.61 km/h)66.93 mph (107.71 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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