Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
225/45r13 vs 215/35r14 Tire Comparison Side By Side
  225/45-13 215/35-14 Difference
Diameter inches (mm) 20.97 (532.7) 19.93 (506.1) -1.05 (-26.6) -5%
Width inches (mm) 8.86 (225) 8.46 (215) -0.39 (-10) -4.4%
Circum. inches (mm) 65.89 (1673.53) 62.6 (1589.96) -3.29 (-83.57) -5%
Sidewall Height inches (mm) 3.99 (101.25) 2.96 (75.25) -1.02 (-26) -25.7%
Revolutions per mile (km) 961.65 (597.54) 1012.19 (628.95) 50.54 (31.41) 5.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19 mph (30.58 km/h)
25 mph (40.23 km/h)23.75 mph (38.22 km/h)
30 mph (48.28 km/h)28.5 mph (45.87 km/h)
35 mph (56.33 km/h)33.25 mph (53.51 km/h)
40 mph (64.37 km/h)38 mph (61.16 km/h)
45 mph (72.42 km/h)42.75 mph (68.8 km/h)
50 mph (80.47 km/h)47.5 mph (76.45 km/h)
55 mph (88.51 km/h)52.25 mph (84.09 km/h)
60 mph (96.56 km/h)57 mph (91.74 km/h)
65 mph (104.61 km/h)61.75 mph (99.38 km/h)
70 mph (112.65 km/h)66.5 mph (107.03 km/h)
75 mph (120.7 km/h)71.25 mph (114.67 km/h)
80 mph (128.75 km/h)76.01 mph (122.32 km/h)
85 mph (136.79 km/h)80.76 mph (129.96 km/h)
90 mph (144.84 km/h)85.51 mph (137.61 km/h)
95 mph (152.89 km/h)90.26 mph (145.25 km/h)
100 mph (160.93 km/h)95.01 mph (152.9 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
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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