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Tire Size Calculator

Tire Size Finder (optional):

Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
305/70r17 vs 315/70r17 Tire Comparison Side By Side
  305/70-17 315/70-17 Difference
Diameter inches (mm) 33.81 (858.8) 34.36 (872.8) 0.55 (14) 1.6%
Width inches (mm) 12.01 (305) 12.4 (315) 0.39 (10) 3.3%
Circum. inches (mm) 106.22 (2698) 107.95 (2741.98) 1.73 (43.98) 1.6%
Sidewall Height inches (mm) 8.41 (213.5) 8.68 (220.5) 0.28 (7) 3.3%
Revolutions per mile (km) 596.5 (370.64) 586.93 (364.7) -9.57 (-5.95) -1.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.33 mph (32.71 km/h)
25 mph (40.23 km/h)25.41 mph (40.89 km/h)
30 mph (48.28 km/h)30.49 mph (49.07 km/h)
35 mph (56.33 km/h)35.57 mph (57.25 km/h)
40 mph (64.37 km/h)40.65 mph (65.42 km/h)
45 mph (72.42 km/h)45.73 mph (73.6 km/h)
50 mph (80.47 km/h)50.82 mph (81.78 km/h)
55 mph (88.51 km/h)55.9 mph (89.96 km/h)
60 mph (96.56 km/h)60.98 mph (98.13 km/h)
65 mph (104.61 km/h)66.06 mph (106.31 km/h)
70 mph (112.65 km/h)71.14 mph (114.49 km/h)
75 mph (120.7 km/h)76.22 mph (122.67 km/h)
80 mph (128.75 km/h)81.3 mph (130.85 km/h)
85 mph (136.79 km/h)86.39 mph (139.02 km/h)
90 mph (144.84 km/h)91.47 mph (147.2 km/h)
95 mph (152.89 km/h)96.55 mph (155.38 km/h)
100 mph (160.93 km/h)101.63 mph (163.56 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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