Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
180/60r16 vs 185/65r16 Tire Comparison Side By Side
  180/60-16 185/65-16 Difference
Diameter inches (mm) 24.5 (622.4) 25.47 (646.9) 0.96 (24.5) 3.9%
Width inches (mm) 7.09 (180) 7.28 (185) 0.2 (5) 2.8%
Circum. inches (mm) 76.98 (1955.33) 80.01 (2032.3) 3.03 (76.97) 3.9%
Sidewall Height inches (mm) 4.25 (108) 4.73 (120.25) 0.48 (12.25) 11.3%
Revolutions per mile (km) 823.06 (511.42) 791.88 (492.05) -31.17 (-19.37) -3.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.79 mph (33.45 km/h)
25 mph (40.23 km/h)25.98 mph (41.82 km/h)
30 mph (48.28 km/h)31.18 mph (50.18 km/h)
35 mph (56.33 km/h)36.38 mph (58.54 km/h)
40 mph (64.37 km/h)41.57 mph (66.91 km/h)
45 mph (72.42 km/h)46.77 mph (75.27 km/h)
50 mph (80.47 km/h)51.97 mph (83.63 km/h)
55 mph (88.51 km/h)57.17 mph (92 km/h)
60 mph (96.56 km/h)62.36 mph (100.36 km/h)
65 mph (104.61 km/h)67.56 mph (108.73 km/h)
70 mph (112.65 km/h)72.76 mph (117.09 km/h)
75 mph (120.7 km/h)77.95 mph (125.45 km/h)
80 mph (128.75 km/h)83.15 mph (133.82 km/h)
85 mph (136.79 km/h)88.35 mph (142.18 km/h)
90 mph (144.84 km/h)93.54 mph (150.54 km/h)
95 mph (152.89 km/h)98.74 mph (158.91 km/h)
100 mph (160.93 km/h)103.94 mph (167.27 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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