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
265/70r17 vs 315/70r17 Tire Comparison Side By Side
  265/70-17 315/70-17 Difference
Diameter inches (mm) 31.61 (802.8) 34.36 (872.8) 2.76 (70) 8.7%
Width inches (mm) 10.43 (265) 12.4 (315) 1.97 (50) 18.9%
Circum. inches (mm) 99.29 (2522.07) 107.95 (2741.98) 8.66 (219.91) 8.7%
Sidewall Height inches (mm) 7.3 (185.5) 8.68 (220.5) 1.38 (35) 18.9%
Revolutions per mile (km) 638.1 (396.5) 586.93 (364.7) -51.18 (-31.8) -8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.74 mph (34.99 km/h)
25 mph (40.23 km/h)27.18 mph (43.74 km/h)
30 mph (48.28 km/h)32.62 mph (52.49 km/h)
35 mph (56.33 km/h)38.05 mph (61.24 km/h)
40 mph (64.37 km/h)43.49 mph (69.99 km/h)
45 mph (72.42 km/h)48.92 mph (78.74 km/h)
50 mph (80.47 km/h)54.36 mph (87.48 km/h)
55 mph (88.51 km/h)59.8 mph (96.23 km/h)
60 mph (96.56 km/h)65.23 mph (104.98 km/h)
65 mph (104.61 km/h)70.67 mph (113.73 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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