Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
245/35r21 vs 275/35r21 Tire Comparison Side By Side
  245/35-21 275/35-21 Difference
Diameter inches (mm) 27.75 (704.9) 28.58 (725.9) 0.83 (21) 3%
Width inches (mm) 9.65 (245) 10.83 (275) 1.18 (30) 12.2%
Circum. inches (mm) 87.19 (2214.51) 89.78 (2280.48) 2.6 (65.97) 3%
Sidewall Height inches (mm) 3.38 (85.75) 3.79 (96.25) 0.41 (10.5) 12.2%
Revolutions per mile (km) 726.73 (451.57) 705.7 (438.5) -21.02 (-13.06) -2.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.6 mph (33.15 km/h)
25 mph (40.23 km/h)25.74 mph (41.43 km/h)
30 mph (48.28 km/h)30.89 mph (49.72 km/h)
35 mph (56.33 km/h)36.04 mph (58.01 km/h)
40 mph (64.37 km/h)41.19 mph (66.29 km/h)
45 mph (72.42 km/h)46.34 mph (74.58 km/h)
50 mph (80.47 km/h)51.49 mph (82.86 km/h)
55 mph (88.51 km/h)56.64 mph (91.15 km/h)
60 mph (96.56 km/h)61.79 mph (99.44 km/h)
65 mph (104.61 km/h)66.94 mph (107.72 km/h)
70 mph (112.65 km/h)72.09 mph (116.01 km/h)
75 mph (120.7 km/h)77.23 mph (124.3 km/h)
80 mph (128.75 km/h)82.38 mph (132.58 km/h)
85 mph (136.79 km/h)87.53 mph (140.87 km/h)
90 mph (144.84 km/h)92.68 mph (149.16 km/h)
95 mph (152.89 km/h)97.83 mph (157.44 km/h)
100 mph (160.93 km/h)102.98 mph (165.73 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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