Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
80/90r17 vs 100/90r17 Tire Comparison Side By Side
  80/90-17 100/90-17 Difference
Diameter inches (mm) 22.67 (575.8) 24.09 (611.8) 1.42 (36) 6.3%
Width inches (mm) 3.15 (80) 3.94 (100) 0.79 (20) 25%
Circum. inches (mm) 71.22 (1808.93) 75.67 (1922.03) 4.45 (113.1) 6.3%
Sidewall Height inches (mm) 2.83 (72) 3.54 (90) 0.71 (18) 25%
Revolutions per mile (km) 889.67 (552.81) 837.32 (520.28) -52.35 (-32.53) -5.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.25 mph (34.2 km/h)
25 mph (40.23 km/h)26.56 mph (42.75 km/h)
30 mph (48.28 km/h)31.88 mph (51.3 km/h)
35 mph (56.33 km/h)37.19 mph (59.85 km/h)
40 mph (64.37 km/h)42.5 mph (68.4 km/h)
45 mph (72.42 km/h)47.81 mph (76.95 km/h)
50 mph (80.47 km/h)53.13 mph (85.5 km/h)
55 mph (88.51 km/h)58.44 mph (94.05 km/h)
60 mph (96.56 km/h)63.75 mph (102.6 km/h)
65 mph (104.61 km/h)69.06 mph (111.15 km/h)
70 mph (112.65 km/h)74.38 mph (119.7 km/h)
75 mph (120.7 km/h)79.69 mph (128.25 km/h)
80 mph (128.75 km/h)85 mph (136.8 km/h)
85 mph (136.79 km/h)90.31 mph (145.35 km/h)
90 mph (144.84 km/h)95.63 mph (153.9 km/h)
95 mph (152.89 km/h)100.94 mph (162.45 km/h)
100 mph (160.93 km/h)106.25 mph (171 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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