Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
255/60r15 vs 275/60r15 Tire Comparison Side By Side
  255/60-15 275/60-15 Difference
Diameter inches (mm) 27.05 (687) 27.99 (711) 0.94 (24) 3.5%
Width inches (mm) 10.04 (255) 10.83 (275) 0.79 (20) 7.8%
Circum. inches (mm) 84.97 (2158.27) 87.94 (2233.67) 2.97 (75.4) 3.5%
Sidewall Height inches (mm) 6.02 (153) 6.5 (165) 0.47 (12) 7.8%
Revolutions per mile (km) 745.66 (463.33) 720.49 (447.69) -25.17 (-15.64) -3.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.7 mph (33.31 km/h)
25 mph (40.23 km/h)25.87 mph (41.64 km/h)
30 mph (48.28 km/h)31.05 mph (49.97 km/h)
35 mph (56.33 km/h)36.22 mph (58.29 km/h)
40 mph (64.37 km/h)41.4 mph (66.62 km/h)
45 mph (72.42 km/h)46.57 mph (74.95 km/h)
50 mph (80.47 km/h)51.75 mph (83.28 km/h)
55 mph (88.51 km/h)56.92 mph (91.61 km/h)
60 mph (96.56 km/h)62.1 mph (99.93 km/h)
65 mph (104.61 km/h)67.27 mph (108.26 km/h)
70 mph (112.65 km/h)72.45 mph (116.59 km/h)
75 mph (120.7 km/h)77.62 mph (124.92 km/h)
80 mph (128.75 km/h)82.79 mph (133.25 km/h)
85 mph (136.79 km/h)87.97 mph (141.57 km/h)
90 mph (144.84 km/h)93.14 mph (149.9 km/h)
95 mph (152.89 km/h)98.32 mph (158.23 km/h)
100 mph (160.93 km/h)103.49 mph (166.56 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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