Tire Size Calculator

Tire Size Finder (optional):

Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
185/50r17 vs 215/55r16 Tire Comparison Side By Side
  185/50-17 215/55-16 Difference
Diameter inches (mm) 24.28 (616.8) 25.31 (642.9) 1.03 (26.1) 4.2%
Width inches (mm) 7.28 (185) 8.46 (215) 1.18 (30) 16.2%
Circum. inches (mm) 76.29 (1937.73) 79.52 (2019.73) 3.23 (82) 4.2%
Sidewall Height inches (mm) 3.64 (92.5) 4.66 (118.25) 1.01 (25.75) 27.8%
Revolutions per mile (km) 830.53 (516.07) 796.81 (495.11) -33.72 (-20.95) -4.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.85 mph (33.55 km/h)
25 mph (40.23 km/h)26.06 mph (41.94 km/h)
30 mph (48.28 km/h)31.27 mph (50.32 km/h)
35 mph (56.33 km/h)36.48 mph (58.71 km/h)
40 mph (64.37 km/h)41.69 mph (67.1 km/h)
45 mph (72.42 km/h)46.9 mph (75.49 km/h)
50 mph (80.47 km/h)52.12 mph (83.87 km/h)
55 mph (88.51 km/h)57.33 mph (92.26 km/h)
60 mph (96.56 km/h)62.54 mph (100.65 km/h)
65 mph (104.61 km/h)67.75 mph (109.03 km/h)
70 mph (112.65 km/h)72.96 mph (117.42 km/h)
75 mph (120.7 km/h)78.17 mph (125.81 km/h)
80 mph (128.75 km/h)83.39 mph (134.2 km/h)
85 mph (136.79 km/h)88.6 mph (142.58 km/h)
90 mph (144.84 km/h)93.81 mph (150.97 km/h)
95 mph (152.89 km/h)99.02 mph (159.36 km/h)
100 mph (160.93 km/h)104.23 mph (167.74 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
20282356253726492770285629513063321833743546368439354211442645654642492753246187
Better Fuel Economy Factory Ratios Increased Power

Most Popular 185/50-R17 Comparisons

To Top