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 315/70r16 Tire Comparison Side By Side
  305/70-16 315/70-16 Difference
Diameter inches (mm) 32.81 (833.4) 33.36 (847.4) 0.55 (14) 1.7%
Width inches (mm) 12.01 (305) 12.4 (315) 0.39 (10) 3.3%
Circum. inches (mm) 103.08 (2618.2) 104.81 (2662.19) 1.73 (43.98) 1.7%
Sidewall Height inches (mm) 8.41 (213.5) 8.68 (220.5) 0.28 (7) 3.3%
Revolutions per mile (km) 614.67 (381.94) 604.52 (375.63) -10.16 (-6.31) -1.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.34 mph (32.73 km/h)
25 mph (40.23 km/h)25.42 mph (40.91 km/h)
30 mph (48.28 km/h)30.5 mph (49.09 km/h)
35 mph (56.33 km/h)35.59 mph (57.27 km/h)
40 mph (64.37 km/h)40.67 mph (65.46 km/h)
45 mph (72.42 km/h)45.76 mph (73.64 km/h)
50 mph (80.47 km/h)50.84 mph (81.82 km/h)
55 mph (88.51 km/h)55.92 mph (90 km/h)
60 mph (96.56 km/h)61.01 mph (98.18 km/h)
65 mph (104.61 km/h)66.09 mph (106.36 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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