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 vs 275/70r17 Tire Comparison Side By Side
  245/70-17 275/70-17 Difference
Diameter inches (mm) 30.5 (774.8) 32.16 (816.8) 1.65 (42) 5.4%
Width inches (mm) 9.65 (245) 10.83 (275) 1.18 (30) 12.2%
Circum. inches (mm) 95.83 (2434.11) 101.03 (2566.05) 5.19 (131.95) 5.4%
Sidewall Height inches (mm) 6.75 (171.5) 7.58 (192.5) 0.83 (21) 12.2%
Revolutions per mile (km) 661.16 (410.83) 627.17 (389.7) -34 (-21.12) -5.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.08 mph (33.93 km/h)
25 mph (40.23 km/h)26.36 mph (42.41 km/h)
30 mph (48.28 km/h)31.63 mph (50.9 km/h)
35 mph (56.33 km/h)36.9 mph (59.38 km/h)
40 mph (64.37 km/h)42.17 mph (67.86 km/h)
45 mph (72.42 km/h)47.44 mph (76.35 km/h)
50 mph (80.47 km/h)52.71 mph (84.83 km/h)
55 mph (88.51 km/h)57.98 mph (93.31 km/h)
60 mph (96.56 km/h)63.25 mph (101.8 km/h)
65 mph (104.61 km/h)68.52 mph (110.28 km/h)
70 mph (112.65 km/h)73.79 mph (118.76 km/h)
75 mph (120.7 km/h)79.07 mph (127.24 km/h)
80 mph (128.75 km/h)84.34 mph (135.73 km/h)
85 mph (136.79 km/h)89.61 mph (144.21 km/h)
90 mph (144.84 km/h)94.88 mph (152.69 km/h)
95 mph (152.89 km/h)100.15 mph (161.18 km/h)
100 mph (160.93 km/h)105.42 mph (169.66 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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