Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
165/82r15 vs 215/75r15 Tire Comparison Side By Side
  165/82-15 215/75-15 Difference
Diameter inches (mm) 25.65 (651.6) 27.7 (703.5) 2.04 (51.9) 8%
Width inches (mm) 6.5 (165) 8.46 (215) 1.97 (50) 30.3%
Circum. inches (mm) 80.59 (2047.06) 87.01 (2210.11) 6.42 (163.05) 8%
Sidewall Height inches (mm) 5.33 (135.3) 6.35 (161.25) 1.02 (25.95) 19.2%
Revolutions per mile (km) 786.17 (488.5) 728.17 (452.47) -58 (-36.04) -7.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.59 mph (34.75 km/h)
25 mph (40.23 km/h)26.99 mph (43.44 km/h)
30 mph (48.28 km/h)32.39 mph (52.13 km/h)
35 mph (56.33 km/h)37.79 mph (60.81 km/h)
40 mph (64.37 km/h)43.19 mph (69.5 km/h)
45 mph (72.42 km/h)48.58 mph (78.19 km/h)
50 mph (80.47 km/h)53.98 mph (86.88 km/h)
55 mph (88.51 km/h)59.38 mph (95.56 km/h)
60 mph (96.56 km/h)64.78 mph (104.25 km/h)
65 mph (104.61 km/h)70.18 mph (112.94 km/h)
70 mph (112.65 km/h)75.58 mph (121.63 km/h)
75 mph (120.7 km/h)80.97 mph (130.31 km/h)
80 mph (128.75 km/h)86.37 mph (139 km/h)
85 mph (136.79 km/h)91.77 mph (147.69 km/h)
90 mph (144.84 km/h)97.17 mph (156.38 km/h)
95 mph (152.89 km/h)102.57 mph (165.07 km/h)
100 mph (160.93 km/h)107.97 mph (173.75 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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