Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
135/90r15 vs 215/60r16 Tire Comparison Side By Side
  135/90-15 215/60-16 Difference
Diameter inches (mm) 24.57 (624) 26.16 (664.4) 1.59 (40.4) 6.5%
Width inches (mm) 5.31 (135) 8.46 (215) 3.15 (80) 59.3%
Circum. inches (mm) 77.18 (1960.35) 82.18 (2087.27) 5 (126.92) 6.5%
Sidewall Height inches (mm) 4.78 (121.5) 5.08 (129) 0.3 (7.5) 6.2%
Revolutions per mile (km) 820.95 (510.11) 771.03 (479.09) -49.92 (-31.02) -6.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.29 mph (34.27 km/h)
25 mph (40.23 km/h)26.62 mph (42.84 km/h)
30 mph (48.28 km/h)31.94 mph (51.41 km/h)
35 mph (56.33 km/h)37.27 mph (59.97 km/h)
40 mph (64.37 km/h)42.59 mph (68.54 km/h)
45 mph (72.42 km/h)47.91 mph (77.11 km/h)
50 mph (80.47 km/h)53.24 mph (85.68 km/h)
55 mph (88.51 km/h)58.56 mph (94.24 km/h)
60 mph (96.56 km/h)63.88 mph (102.81 km/h)
65 mph (104.61 km/h)69.21 mph (111.38 km/h)
70 mph (112.65 km/h)74.53 mph (119.95 km/h)
75 mph (120.7 km/h)79.86 mph (128.52 km/h)
80 mph (128.75 km/h)85.18 mph (137.08 km/h)
85 mph (136.79 km/h)90.5 mph (145.65 km/h)
90 mph (144.84 km/h)95.83 mph (154.22 km/h)
95 mph (152.89 km/h)101.15 mph (162.79 km/h)
100 mph (160.93 km/h)106.47 mph (171.35 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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