Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
275/40r17 vs 305/45r17 Tire Comparison Side By Side
  275/40-17 305/45-17 Difference
Diameter inches (mm) 25.66 (651.8) 27.81 (706.3) 2.15 (54.5) 8.4%
Width inches (mm) 10.83 (275) 12.01 (305) 1.18 (30) 10.9%
Circum. inches (mm) 80.62 (2047.69) 87.36 (2218.91) 6.74 (171.22) 8.4%
Sidewall Height inches (mm) 4.33 (110) 5.4 (137.25) 1.07 (27.25) 24.8%
Revolutions per mile (km) 785.93 (488.35) 725.29 (450.67) -60.64 (-37.68) -7.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.67 mph (34.88 km/h)
25 mph (40.23 km/h)27.09 mph (43.6 km/h)
30 mph (48.28 km/h)32.51 mph (52.32 km/h)
35 mph (56.33 km/h)37.93 mph (61.04 km/h)
40 mph (64.37 km/h)43.34 mph (69.76 km/h)
45 mph (72.42 km/h)48.76 mph (78.48 km/h)
50 mph (80.47 km/h)54.18 mph (87.2 km/h)
55 mph (88.51 km/h)59.6 mph (95.92 km/h)
60 mph (96.56 km/h)65.02 mph (104.63 km/h)
65 mph (104.61 km/h)70.43 mph (113.35 km/h)
70 mph (112.65 km/h)75.85 mph (122.07 km/h)
75 mph (120.7 km/h)81.27 mph (130.79 km/h)
80 mph (128.75 km/h)86.69 mph (139.51 km/h)
85 mph (136.79 km/h)92.11 mph (148.23 km/h)
90 mph (144.84 km/h)97.53 mph (156.95 km/h)
95 mph (152.89 km/h)102.94 mph (165.67 km/h)
100 mph (160.93 km/h)108.36 mph (174.39 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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