Ford CMP axle ratios?

[Grant Bowker]

Originally Posted by Hanno Spoelstra

Grant, does the AEDB list 9.00-16 tyre diameters so we can compute F15 and F15A engine rpm @ 25 mph?

More tire sizes:
9.00-16, between 34.8 and 35.7 inches
8.25-10 27.8
9.00-13 30.7 to 31.5
9.25-16 33.3 to33.4
14.00-20 47.5 to 47.7

All of the above are from the table for "Regular Pneumatic - Cross Country Tread Design". There are separate tables for "Regular Pneumatic - Highway Tread Design" and "Run Flat - Cross Country Tread Design". Technically, a more accurate road speed to engine speed relationship would be obtained by using "loaded radius" rather than the quoted "free diameter" however the difference between the values will vary with vehicle weight/load, inflation pressure, tire wear etc.