Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
275/65r18 vs 265/60r18 Tire Comparison Side By Side
  275/65-18 265/60-18 Difference
Diameter inches (mm) 32.07 (814.7) 30.52 (775.2) -1.56 (-39.5) -4.8%
Width inches (mm) 10.83 (275) 10.43 (265) -0.39 (-10) -3.6%
Circum. inches (mm) 100.77 (2559.46) 95.88 (2435.36) -4.89 (-124.09) -4.8%
Sidewall Height inches (mm) 7.04 (178.75) 6.26 (159) -0.78 (-19.75) -11%
Revolutions per mile (km) 628.78 (390.71) 660.82 (410.62) 32.04 (19.91) 5.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.03 mph (30.63 km/h)
25 mph (40.23 km/h)23.79 mph (38.28 km/h)
30 mph (48.28 km/h)28.55 mph (45.94 km/h)
35 mph (56.33 km/h)33.3 mph (53.6 km/h)
40 mph (64.37 km/h)38.06 mph (61.25 km/h)
45 mph (72.42 km/h)42.82 mph (68.91 km/h)
50 mph (80.47 km/h)47.58 mph (76.57 km/h)
55 mph (88.51 km/h)52.33 mph (84.22 km/h)
60 mph (96.56 km/h)57.09 mph (91.88 km/h)
65 mph (104.61 km/h)61.85 mph (99.54 km/h)
70 mph (112.65 km/h)66.61 mph (107.19 km/h)
75 mph (120.7 km/h)71.36 mph (114.85 km/h)
80 mph (128.75 km/h)76.12 mph (122.51 km/h)
85 mph (136.79 km/h)80.88 mph (130.16 km/h)
90 mph (144.84 km/h)85.64 mph (137.82 km/h)
95 mph (152.89 km/h)90.39 mph (145.48 km/h)
100 mph (160.93 km/h)95.15 mph (153.13 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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