Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
295/35r21 vs 285/40r21 Tire Comparison Side By Side
  295/35-21 285/40-21 Difference
Diameter inches (mm) 29.13 (739.9) 29.98 (761.4) 0.85 (21.5) 2.9%
Width inches (mm) 11.61 (295) 11.22 (285) -0.39 (-10) -3.4%
Circum. inches (mm) 91.51 (2324.46) 94.17 (2392.01) 2.66 (67.54) 2.9%
Sidewall Height inches (mm) 4.06 (103.25) 4.49 (114) 0.42 (10.75) 10.4%
Revolutions per mile (km) 692.35 (430.21) 672.8 (418.06) -19.55 (-12.15) -2.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.58 mph (33.12 km/h)
25 mph (40.23 km/h)25.73 mph (41.4 km/h)
30 mph (48.28 km/h)30.87 mph (49.68 km/h)
35 mph (56.33 km/h)36.02 mph (57.96 km/h)
40 mph (64.37 km/h)41.16 mph (66.24 km/h)
45 mph (72.42 km/h)46.31 mph (74.53 km/h)
50 mph (80.47 km/h)51.45 mph (82.81 km/h)
55 mph (88.51 km/h)56.6 mph (91.09 km/h)
60 mph (96.56 km/h)61.74 mph (99.37 km/h)
65 mph (104.61 km/h)66.89 mph (107.65 km/h)
70 mph (112.65 km/h)72.03 mph (115.93 km/h)
75 mph (120.7 km/h)77.18 mph (124.21 km/h)
80 mph (128.75 km/h)82.32 mph (132.49 km/h)
85 mph (136.79 km/h)87.47 mph (140.77 km/h)
90 mph (144.84 km/h)92.62 mph (149.05 km/h)
95 mph (152.89 km/h)97.76 mph (157.33 km/h)
100 mph (160.93 km/h)102.91 mph (165.61 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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