Tire Size Calculator

Tire Size Finder (optional):

Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
57/90r14 vs 70/90r14 Tire Comparison Side By Side
  57/90-14 70/90-14 Difference
Diameter inches (mm) 18.04 (458.2) 18.96 (481.6) 0.92 (23.4) 5.1%
Width inches (mm) 2.24 (57) 2.76 (70) 0.51 (13) 22.8%
Circum. inches (mm) 56.67 (1439.48) 59.57 (1512.99) 2.89 (73.51) 5.1%
Sidewall Height inches (mm) 2.02 (51.3) 2.48 (63) 0.46 (11.7) 22.8%
Revolutions per mile (km) 1118.01 (694.7) 1063.68 (660.94) -54.32 (-33.75) -4.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.02 mph (33.83 km/h)
25 mph (40.23 km/h)26.28 mph (42.29 km/h)
30 mph (48.28 km/h)31.53 mph (50.75 km/h)
35 mph (56.33 km/h)36.79 mph (59.2 km/h)
40 mph (64.37 km/h)42.04 mph (67.66 km/h)
45 mph (72.42 km/h)47.3 mph (76.12 km/h)
50 mph (80.47 km/h)52.55 mph (84.58 km/h)
55 mph (88.51 km/h)57.81 mph (93.03 km/h)
60 mph (96.56 km/h)63.06 mph (101.49 km/h)
65 mph (104.61 km/h)68.32 mph (109.95 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
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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