Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
265/65r15 vs 31/9.5r15 Tire Comparison Side By Side
  265/65-15 31/9.5-15 Difference
Diameter inches (mm) 28.56 (725.5) 30.94 (785.88) 2.38 (60.38) 8.3%
Width inches (mm) 10.43 (265) 9.49 (241) -0.94 (-24) -9.1%
Circum. inches (mm) 89.73 (2279.23) 97.2 (2468.91) 7.47 (189.69) 8.3%
Sidewall Height inches (mm) 6.78 (172.25) 7.97 (202.44) 1.19 (30.19) 17.5%
Revolutions per mile (km) 706.09 (438.74) 651.84 (405.04) -54.25 (-33.71) -7.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.66 mph (34.87 km/h)
25 mph (40.23 km/h)27.08 mph (43.58 km/h)
30 mph (48.28 km/h)32.5 mph (52.3 km/h)
35 mph (56.33 km/h)37.91 mph (61.01 km/h)
40 mph (64.37 km/h)43.33 mph (69.73 km/h)
45 mph (72.42 km/h)48.75 mph (78.45 km/h)
50 mph (80.47 km/h)54.16 mph (87.16 km/h)
55 mph (88.51 km/h)59.58 mph (95.88 km/h)
60 mph (96.56 km/h)64.99 mph (104.6 km/h)
65 mph (104.61 km/h)70.41 mph (113.31 km/h)
70 mph (112.65 km/h)75.83 mph (122.03 km/h)
75 mph (120.7 km/h)81.24 mph (130.75 km/h)
80 mph (128.75 km/h)86.66 mph (139.46 km/h)
85 mph (136.79 km/h)92.07 mph (148.18 km/h)
90 mph (144.84 km/h)97.49 mph (156.9 km/h)
95 mph (152.89 km/h)102.91 mph (165.61 km/h)
100 mph (160.93 km/h)108.32 mph (174.33 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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