Mike "Wuzzy121". Rest in peace, brother

Tire Size Calculator

Tire Size Finder (optional):

Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
255/40r10 vs 255/40r20 Tire Comparison Side By Side
  255/40-10 255/40-20 Difference
Diameter inches (mm) 18.03 (458) 28.03 (712) 10 (254) 55.5%
Width inches (mm) 10.04 (255) 10.04 (255) 0 (0) 0%
Circum. inches (mm) 56.65 (1438.85) 88.06 (2236.81) 31.42 (797.96) 55.5%
Sidewall Height inches (mm) 4.02 (102) 4.02 (102) 0 (0) 0%
Revolutions per mile (km) 1118.49 (695) 719.48 (447.06) -399.01 (-247.93) -35.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)31.09 mph (50.04 km/h)
25 mph (40.23 km/h)38.86 mph (62.55 km/h)
30 mph (48.28 km/h)46.64 mph (75.06 km/h)
35 mph (56.33 km/h)54.41 mph (87.57 km/h)
40 mph (64.37 km/h)62.18 mph (100.07 km/h)
45 mph (72.42 km/h)69.96 mph (112.58 km/h)
50 mph (80.47 km/h)77.73 mph (125.09 km/h)
55 mph (88.51 km/h)85.5 mph (137.6 km/h)
60 mph (96.56 km/h)93.28 mph (150.11 km/h)
65 mph (104.61 km/h)101.05 mph (162.62 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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