Tire Size Calculator

Tire Size Finder (optional):

Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
275/55r21 vs 275/50r22 Tire Comparison Side By Side
  275/55-21 275/50-22 Difference
Diameter inches (mm) 32.91 (835.9) 32.83 (833.8) -0.08 (-2.1) -0.3%
Width inches (mm) 10.83 (275) 10.83 (275) 0 (0) 0%
Circum. inches (mm) 103.39 (2626.06) 103.13 (2619.46) -0.26 (-6.6) -0.3%
Sidewall Height inches (mm) 5.95 (151.25) 5.41 (137.5) -0.54 (-13.75) -9.1%
Revolutions per mile (km) 612.84 (380.8) 614.38 (381.76) 1.54 (0.96) 0.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.95 mph (32.11 km/h)
25 mph (40.23 km/h)24.94 mph (40.13 km/h)
30 mph (48.28 km/h)29.92 mph (48.16 km/h)
35 mph (56.33 km/h)34.91 mph (56.19 km/h)
40 mph (64.37 km/h)39.9 mph (64.21 km/h)
45 mph (72.42 km/h)44.89 mph (72.24 km/h)
50 mph (80.47 km/h)49.87 mph (80.27 km/h)
55 mph (88.51 km/h)54.86 mph (88.29 km/h)
60 mph (96.56 km/h)59.85 mph (96.32 km/h)
65 mph (104.61 km/h)64.84 mph (104.34 km/h)
70 mph (112.65 km/h)69.82 mph (112.37 km/h)
75 mph (120.7 km/h)74.81 mph (120.4 km/h)
80 mph (128.75 km/h)79.8 mph (128.42 km/h)
85 mph (136.79 km/h)84.79 mph (136.45 km/h)
90 mph (144.84 km/h)89.77 mph (144.48 km/h)
95 mph (152.89 km/h)94.76 mph (152.5 km/h)
100 mph (160.93 km/h)99.75 mph (160.53 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
15631816195620432136220222752362248226012734284130343247341335193579379941054770
Better Fuel Economy Factory Ratios Increased Power

Most Popular 275/55-R21 Comparisons

To Top