Mike "Wuzzy121". Rest in peace, brother

Tire Size Calculator

Tire Size Finder (optional):

Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
305/70r16 vs 315/75r16 Tire Comparison Side By Side
  305/70-16 315/75-16 Difference
Diameter inches (mm) 32.81 (833.4) 34.6 (878.9) 1.79 (45.5) 5.5%
Width inches (mm) 12.01 (305) 12.4 (315) 0.39 (10) 3.3%
Circum. inches (mm) 103.08 (2618.2) 108.71 (2761.15) 5.63 (142.94) 5.5%
Sidewall Height inches (mm) 8.41 (213.5) 9.3 (236.25) 0.9 (22.75) 10.7%
Revolutions per mile (km) 614.67 (381.94) 582.85 (362.17) -31.82 (-19.77) -5.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.09 mph (33.94 km/h)
25 mph (40.23 km/h)26.36 mph (42.43 km/h)
30 mph (48.28 km/h)31.64 mph (50.92 km/h)
35 mph (56.33 km/h)36.91 mph (59.4 km/h)
40 mph (64.37 km/h)42.18 mph (67.89 km/h)
45 mph (72.42 km/h)47.46 mph (76.37 km/h)
50 mph (80.47 km/h)52.73 mph (84.86 km/h)
55 mph (88.51 km/h)58 mph (93.35 km/h)
60 mph (96.56 km/h)63.28 mph (101.83 km/h)
65 mph (104.61 km/h)68.55 mph (110.32 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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