Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
215/75r15 vs 225/70r15 Tire Comparison Side By Side
  215/75-15 225/70-15 Difference
Diameter inches (mm) 27.7 (703.5) 27.4 (696) -0.3 (-7.5) -1.1%
Width inches (mm) 8.46 (215) 8.86 (225) 0.39 (10) 4.7%
Circum. inches (mm) 87.01 (2210.11) 86.08 (2186.55) -0.93 (-23.56) -1.1%
Sidewall Height inches (mm) 6.35 (161.25) 6.2 (157.5) -0.15 (-3.75) -2.3%
Revolutions per mile (km) 728.17 (452.47) 736.02 (457.34) 7.85 (4.88) 1.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.79 mph (31.84 km/h)
25 mph (40.23 km/h)24.73 mph (39.8 km/h)
30 mph (48.28 km/h)29.68 mph (47.77 km/h)
35 mph (56.33 km/h)34.63 mph (55.73 km/h)
40 mph (64.37 km/h)39.57 mph (63.69 km/h)
45 mph (72.42 km/h)44.52 mph (71.65 km/h)
50 mph (80.47 km/h)49.47 mph (79.61 km/h)
55 mph (88.51 km/h)54.41 mph (87.57 km/h)
60 mph (96.56 km/h)59.36 mph (95.53 km/h)
65 mph (104.61 km/h)64.31 mph (103.49 km/h)
70 mph (112.65 km/h)69.25 mph (111.45 km/h)
75 mph (120.7 km/h)74.2 mph (119.41 km/h)
80 mph (128.75 km/h)79.15 mph (127.38 km/h)
85 mph (136.79 km/h)84.09 mph (135.34 km/h)
90 mph (144.84 km/h)89.04 mph (143.3 km/h)
95 mph (152.89 km/h)93.99 mph (151.26 km/h)
100 mph (160.93 km/h)98.93 mph (159.22 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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