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 305/70r17 Tire Comparison Side By Side
  265/70-17 305/70-17 Difference
Diameter inches (mm) 31.61 (802.8) 33.81 (858.8) 2.2 (56) 7%
Width inches (mm) 10.43 (265) 12.01 (305) 1.57 (40) 15.1%
Circum. inches (mm) 99.29 (2522.07) 106.22 (2698) 6.93 (175.93) 7%
Sidewall Height inches (mm) 7.3 (185.5) 8.41 (213.5) 1.1 (28) 15.1%
Revolutions per mile (km) 638.1 (396.5) 596.5 (370.64) -41.61 (-25.85) -6.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.4 mph (34.43 km/h)
25 mph (40.23 km/h)26.74 mph (43.04 km/h)
30 mph (48.28 km/h)32.09 mph (51.65 km/h)
35 mph (56.33 km/h)37.44 mph (60.26 km/h)
40 mph (64.37 km/h)42.79 mph (68.86 km/h)
45 mph (72.42 km/h)48.14 mph (77.47 km/h)
50 mph (80.47 km/h)53.49 mph (86.08 km/h)
55 mph (88.51 km/h)58.84 mph (94.69 km/h)
60 mph (96.56 km/h)64.19 mph (103.3 km/h)
65 mph (104.61 km/h)69.53 mph (111.9 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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