Tire Size Calculator

Tire Size Finder (optional):

Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
225/45r20 vs 215/70r16 Tire Comparison Side By Side
  225/45-20 215/70-16 Difference
Diameter inches (mm) 27.97 (710.5) 27.85 (707.4) -0.12 (-3.1) -0.4%
Width inches (mm) 8.86 (225) 8.46 (215) -0.39 (-10) -4.4%
Circum. inches (mm) 87.88 (2232.1) 87.49 (2222.36) -0.38 (-9.74) -0.4%
Sidewall Height inches (mm) 3.99 (101.25) 5.93 (150.5) 1.94 (49.25) 48.6%
Revolutions per mile (km) 721 (448.01) 724.16 (449.97) 3.16 (1.96) 0.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.91 mph (32.05 km/h)
25 mph (40.23 km/h)24.89 mph (40.06 km/h)
30 mph (48.28 km/h)29.87 mph (48.07 km/h)
35 mph (56.33 km/h)34.85 mph (56.08 km/h)
40 mph (64.37 km/h)39.83 mph (64.09 km/h)
45 mph (72.42 km/h)44.8 mph (72.1 km/h)
50 mph (80.47 km/h)49.78 mph (80.12 km/h)
55 mph (88.51 km/h)54.76 mph (88.13 km/h)
60 mph (96.56 km/h)59.74 mph (96.14 km/h)
65 mph (104.61 km/h)64.72 mph (104.15 km/h)
70 mph (112.65 km/h)69.69 mph (112.16 km/h)
75 mph (120.7 km/h)74.67 mph (120.17 km/h)
80 mph (128.75 km/h)79.65 mph (128.19 km/h)
85 mph (136.79 km/h)84.63 mph (136.2 km/h)
90 mph (144.84 km/h)89.61 mph (144.21 km/h)
95 mph (152.89 km/h)94.59 mph (152.22 km/h)
100 mph (160.93 km/h)99.56 mph (160.23 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
18432141230624072517259626822784292530663223334835763827402341484219447848385623
Better Fuel Economy Factory Ratios Increased Power

Most Popular 225/45-R20 Comparisons

To Top