Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
150/80r15 vs 130/90r15 Tire Comparison Side By Side
  150/80-15 130/90-15 Difference
Diameter inches (mm) 24.45 (621) 24.21 (615) -0.24 (-6) -1%
Width inches (mm) 5.91 (150) 5.12 (130) -0.79 (-20) -13.3%
Circum. inches (mm) 76.81 (1950.93) 76.07 (1932.08) -0.74 (-18.85) -1%
Sidewall Height inches (mm) 4.72 (120) 4.61 (117) -0.12 (-3) -2.5%
Revolutions per mile (km) 824.91 (512.58) 832.96 (517.58) 8.05 (5) 1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.81 mph (31.88 km/h)
25 mph (40.23 km/h)24.76 mph (39.84 km/h)
30 mph (48.28 km/h)29.71 mph (47.81 km/h)
35 mph (56.33 km/h)34.66 mph (55.78 km/h)
40 mph (64.37 km/h)39.61 mph (63.75 km/h)
45 mph (72.42 km/h)44.57 mph (71.72 km/h)
50 mph (80.47 km/h)49.52 mph (79.69 km/h)
55 mph (88.51 km/h)54.47 mph (87.66 km/h)
60 mph (96.56 km/h)59.42 mph (95.63 km/h)
65 mph (104.61 km/h)64.37 mph (103.6 km/h)
70 mph (112.65 km/h)69.32 mph (111.57 km/h)
75 mph (120.7 km/h)74.28 mph (119.53 km/h)
80 mph (128.75 km/h)79.23 mph (127.5 km/h)
85 mph (136.79 km/h)84.18 mph (135.47 km/h)
90 mph (144.84 km/h)89.13 mph (143.44 km/h)
95 mph (152.89 km/h)94.08 mph (151.41 km/h)
100 mph (160.93 km/h)99.03 mph (159.38 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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