Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
255/75r15 vs 265/75r15 Tire Comparison Side By Side
  255/75-15 265/75-15 Difference
Diameter inches (mm) 30.06 (763.5) 30.65 (778.5) 0.59 (15) 2%
Width inches (mm) 10.04 (255) 10.43 (265) 0.39 (10) 3.9%
Circum. inches (mm) 94.43 (2398.61) 96.29 (2445.73) 1.86 (47.12) 2%
Sidewall Height inches (mm) 7.53 (191.25) 7.82 (198.75) 0.3 (7.5) 3.9%
Revolutions per mile (km) 670.95 (416.91) 658.02 (408.88) -12.93 (-8.03) -1.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.39 mph (32.82 km/h)
25 mph (40.23 km/h)25.49 mph (41.02 km/h)
30 mph (48.28 km/h)30.59 mph (49.23 km/h)
35 mph (56.33 km/h)35.69 mph (57.43 km/h)
40 mph (64.37 km/h)40.79 mph (65.64 km/h)
45 mph (72.42 km/h)45.88 mph (73.84 km/h)
50 mph (80.47 km/h)50.98 mph (82.05 km/h)
55 mph (88.51 km/h)56.08 mph (90.25 km/h)
60 mph (96.56 km/h)61.18 mph (98.46 km/h)
65 mph (104.61 km/h)66.28 mph (106.66 km/h)
70 mph (112.65 km/h)71.38 mph (114.87 km/h)
75 mph (120.7 km/h)76.47 mph (123.07 km/h)
80 mph (128.75 km/h)81.57 mph (131.28 km/h)
85 mph (136.79 km/h)86.67 mph (139.48 km/h)
90 mph (144.84 km/h)91.77 mph (147.69 km/h)
95 mph (152.89 km/h)96.87 mph (155.89 km/h)
100 mph (160.93 km/h)101.96 mph (164.1 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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