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 235/60r15 Tire Comparison Side By Side
  255/60-15 235/60-15 Difference
Diameter inches (mm) 27.05 (687) 26.1 (663) -0.94 (-24) -3.5%
Width inches (mm) 10.04 (255) 9.25 (235) -0.79 (-20) -7.8%
Circum. inches (mm) 84.97 (2158.27) 82 (2082.88) -2.97 (-75.4) -3.5%
Sidewall Height inches (mm) 6.02 (153) 5.55 (141) -0.47 (-12) -7.8%
Revolutions per mile (km) 745.66 (463.33) 772.65 (480.1) 26.99 (16.77) 3.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.3 mph (31.06 km/h)
25 mph (40.23 km/h)24.13 mph (38.83 km/h)
30 mph (48.28 km/h)28.95 mph (46.59 km/h)
35 mph (56.33 km/h)33.78 mph (54.36 km/h)
40 mph (64.37 km/h)38.6 mph (62.13 km/h)
45 mph (72.42 km/h)43.43 mph (69.89 km/h)
50 mph (80.47 km/h)48.25 mph (77.66 km/h)
55 mph (88.51 km/h)53.08 mph (85.42 km/h)
60 mph (96.56 km/h)57.9 mph (93.19 km/h)
65 mph (104.61 km/h)62.73 mph (100.95 km/h)
70 mph (112.65 km/h)67.55 mph (108.72 km/h)
75 mph (120.7 km/h)72.38 mph (116.48 km/h)
80 mph (128.75 km/h)77.21 mph (124.25 km/h)
85 mph (136.79 km/h)82.03 mph (132.02 km/h)
90 mph (144.84 km/h)86.86 mph (139.78 km/h)
95 mph (152.89 km/h)91.68 mph (147.55 km/h)
100 mph (160.93 km/h)96.51 mph (155.31 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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