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
90/90r10 vs 80/90r10 Tire Comparison Side By Side
  90/90-10 80/90-10 Difference
Diameter inches (mm) 16.38 (416) 15.67 (398) -0.71 (-18) -4.3%
Width inches (mm) 3.54 (90) 3.15 (80) -0.39 (-10) -11.1%
Circum. inches (mm) 51.45 (1306.9) 49.23 (1250.35) -2.23 (-56.55) -4.3%
Sidewall Height inches (mm) 3.19 (81) 2.83 (72) -0.35 (-9) -11.1%
Revolutions per mile (km) 1231.42 (765.17) 1287.11 (799.77) 55.69 (34.61) 4.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.13 mph (30.79 km/h)
25 mph (40.23 km/h)23.92 mph (38.49 km/h)
30 mph (48.28 km/h)28.7 mph (46.19 km/h)
35 mph (56.33 km/h)33.49 mph (53.89 km/h)
40 mph (64.37 km/h)38.27 mph (61.59 km/h)
45 mph (72.42 km/h)43.05 mph (69.29 km/h)
50 mph (80.47 km/h)47.84 mph (76.99 km/h)
55 mph (88.51 km/h)52.62 mph (84.68 km/h)
60 mph (96.56 km/h)57.4 mph (92.38 km/h)
65 mph (104.61 km/h)62.19 mph (100.08 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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