Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
225/50r16 vs 215/50r16 Tire Comparison Side By Side
  225/50-16 215/50-16 Difference
Diameter inches (mm) 24.86 (631.4) 24.46 (621.4) -0.39 (-10) -1.6%
Width inches (mm) 8.86 (225) 8.46 (215) -0.39 (-10) -4.4%
Circum. inches (mm) 78.09 (1983.6) 76.86 (1952.19) -1.24 (-31.42) -1.6%
Sidewall Height inches (mm) 4.43 (112.5) 4.23 (107.5) -0.2 (-5) -4.4%
Revolutions per mile (km) 811.32 (504.13) 824.38 (512.25) 13.06 (8.11) 1.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.68 mph (31.68 km/h)
25 mph (40.23 km/h)24.6 mph (39.6 km/h)
30 mph (48.28 km/h)29.52 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 (63.35 km/h)
45 mph (72.42 km/h)44.29 mph (71.27 km/h)
50 mph (80.47 km/h)49.21 mph (79.19 km/h)
55 mph (88.51 km/h)54.13 mph (87.11 km/h)
60 mph (96.56 km/h)59.05 mph (95.03 km/h)
65 mph (104.61 km/h)63.97 mph (102.95 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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