Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
215/75r16 vs 245/75r16 Tire Comparison Side By Side
  215/75-16 245/75-16 Difference
Diameter inches (mm) 28.7 (728.9) 30.47 (773.9) 1.77 (45) 6.2%
Width inches (mm) 8.46 (215) 9.65 (245) 1.18 (30) 14%
Circum. inches (mm) 90.15 (2289.91) 95.72 (2431.28) 5.57 (141.37) 6.2%
Sidewall Height inches (mm) 6.35 (161.25) 7.23 (183.75) 0.89 (22.5) 14%
Revolutions per mile (km) 702.8 (436.7) 661.93 (411.31) -40.87 (-25.39) -5.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.23 mph (34.17 km/h)
25 mph (40.23 km/h)26.54 mph (42.72 km/h)
30 mph (48.28 km/h)31.85 mph (51.26 km/h)
35 mph (56.33 km/h)37.16 mph (59.8 km/h)
40 mph (64.37 km/h)42.47 mph (68.35 km/h)
45 mph (72.42 km/h)47.78 mph (76.89 km/h)
50 mph (80.47 km/h)53.09 mph (85.44 km/h)
55 mph (88.51 km/h)58.4 mph (93.98 km/h)
60 mph (96.56 km/h)63.7 mph (102.52 km/h)
65 mph (104.61 km/h)69.01 mph (111.07 km/h)
70 mph (112.65 km/h)74.32 mph (119.61 km/h)
75 mph (120.7 km/h)79.63 mph (128.15 km/h)
80 mph (128.75 km/h)84.94 mph (136.7 km/h)
85 mph (136.79 km/h)90.25 mph (145.24 km/h)
90 mph (144.84 km/h)95.56 mph (153.78 km/h)
95 mph (152.89 km/h)100.87 mph (162.33 km/h)
100 mph (160.93 km/h)106.17 mph (170.87 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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