Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
245/70r17.5 vs 245/70r19.5 Tire Comparison Side By Side
  245/70-17.5 245/70-19.5 Difference
Diameter inches (mm) 31 (787.5) 33 (838.3) 2 (50.8) 6.5%
Width inches (mm) 9.65 (245) 9.65 (245) 0 (0) 0%
Circum. inches (mm) 97.4 (2474) 103.68 (2633.6) 6.28 (159.59) 6.5%
Sidewall Height inches (mm) 6.75 (171.5) 6.75 (171.5) 0 (0) 0%
Revolutions per mile (km) 650.5 (404.2) 611.08 (379.71) -39.42 (-24.49) -6.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.29 mph (34.26 km/h)
25 mph (40.23 km/h)26.61 mph (42.83 km/h)
30 mph (48.28 km/h)31.94 mph (51.39 km/h)
35 mph (56.33 km/h)37.26 mph (59.96 km/h)
40 mph (64.37 km/h)42.58 mph (68.53 km/h)
45 mph (72.42 km/h)47.9 mph (77.09 km/h)
50 mph (80.47 km/h)53.23 mph (85.66 km/h)
55 mph (88.51 km/h)58.55 mph (94.22 km/h)
60 mph (96.56 km/h)63.87 mph (102.79 km/h)
65 mph (104.61 km/h)69.19 mph (111.36 km/h)
70 mph (112.65 km/h)74.52 mph (119.92 km/h)
75 mph (120.7 km/h)79.84 mph (128.49 km/h)
80 mph (128.75 km/h)85.16 mph (137.05 km/h)
85 mph (136.79 km/h)90.48 mph (145.62 km/h)
90 mph (144.84 km/h)95.81 mph (154.18 km/h)
95 mph (152.89 km/h)101.13 mph (162.75 km/h)
100 mph (160.93 km/h)106.45 mph (171.32 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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