Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
265/75r15 vs 235/75r15 Tire Comparison Side By Side
  265/75-15 235/75-15 Difference
Diameter inches (mm) 30.65 (778.5) 28.88 (733.5) -1.77 (-45) -5.8%
Width inches (mm) 10.43 (265) 9.25 (235) -1.18 (-30) -11.3%
Circum. inches (mm) 96.29 (2445.73) 90.72 (2304.36) -5.57 (-141.37) -5.8%
Sidewall Height inches (mm) 7.82 (198.75) 6.94 (176.25) -0.89 (-22.5) -11.3%
Revolutions per mile (km) 658.02 (408.88) 698.39 (433.96) 40.37 (25.08) 6.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.84 mph (30.33 km/h)
25 mph (40.23 km/h)23.55 mph (37.91 km/h)
30 mph (48.28 km/h)28.27 mph (45.49 km/h)
35 mph (56.33 km/h)32.98 mph (53.07 km/h)
40 mph (64.37 km/h)37.69 mph (60.65 km/h)
45 mph (72.42 km/h)42.4 mph (68.23 km/h)
50 mph (80.47 km/h)47.11 mph (75.82 km/h)
55 mph (88.51 km/h)51.82 mph (83.4 km/h)
60 mph (96.56 km/h)56.53 mph (90.98 km/h)
65 mph (104.61 km/h)61.24 mph (98.56 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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