Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
260/65r18 vs 260/75r18 Tire Comparison Side By Side
  260/65-18 260/75-18 Difference
Diameter inches (mm) 31.31 (795.2) 33.35 (847.2) 2.05 (52) 6.5%
Width inches (mm) 10.24 (260) 10.24 (260) 0 (0) 0%
Circum. inches (mm) 98.35 (2498.19) 104.79 (2661.56) 6.43 (163.36) 6.5%
Sidewall Height inches (mm) 6.65 (169) 7.68 (195) 1.02 (26) 15.4%
Revolutions per mile (km) 644.2 (400.29) 604.66 (375.72) -39.54 (-24.57) -6.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.31 mph (34.29 km/h)
25 mph (40.23 km/h)26.63 mph (42.86 km/h)
30 mph (48.28 km/h)31.96 mph (51.44 km/h)
35 mph (56.33 km/h)37.29 mph (60.01 km/h)
40 mph (64.37 km/h)42.62 mph (68.58 km/h)
45 mph (72.42 km/h)47.94 mph (77.16 km/h)
50 mph (80.47 km/h)53.27 mph (85.73 km/h)
55 mph (88.51 km/h)58.6 mph (94.3 km/h)
60 mph (96.56 km/h)63.92 mph (102.88 km/h)
65 mph (104.61 km/h)69.25 mph (111.45 km/h)
70 mph (112.65 km/h)74.58 mph (120.02 km/h)
75 mph (120.7 km/h)79.9 mph (128.59 km/h)
80 mph (128.75 km/h)85.23 mph (137.17 km/h)
85 mph (136.79 km/h)90.56 mph (145.74 km/h)
90 mph (144.84 km/h)95.89 mph (154.31 km/h)
95 mph (152.89 km/h)101.21 mph (162.89 km/h)
100 mph (160.93 km/h)106.54 mph (171.46 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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