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
215/85r16 vs 235/75r16 Tire Comparison Side By Side
  215/85-16 235/75-16 Difference
Diameter inches (mm) 30.39 (771.9) 29.88 (758.9) -0.51 (-13) -1.7%
Width inches (mm) 8.46 (215) 9.25 (235) 0.79 (20) 9.3%
Circum. inches (mm) 95.47 (2425) 93.86 (2384.15) -1.61 (-40.84) -1.7%
Sidewall Height inches (mm) 7.19 (182.75) 6.94 (176.25) -0.26 (-6.5) -3.6%
Revolutions per mile (km) 663.65 (412.37) 675.02 (419.44) 11.37 (7.06) 1.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.66 mph (31.64 km/h)
25 mph (40.23 km/h)24.58 mph (39.56 km/h)
30 mph (48.28 km/h)29.49 mph (47.47 km/h)
35 mph (56.33 km/h)34.41 mph (55.38 km/h)
40 mph (64.37 km/h)39.33 mph (63.29 km/h)
45 mph (72.42 km/h)44.24 mph (71.2 km/h)
50 mph (80.47 km/h)49.16 mph (79.11 km/h)
55 mph (88.51 km/h)54.07 mph (87.02 km/h)
60 mph (96.56 km/h)58.99 mph (94.93 km/h)
65 mph (104.61 km/h)63.91 mph (102.85 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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