Ford tire size vs speedometer conversion constant chart K19256-C

Scanned Ford chart K19256-C listing tire descriptions by size/type/SAE revolutions per mile against speedometer/odometer conversion constants for various axle ratios. Rows cover P215/75R15, P235/75R15, 31-10.50R15, LT215/85R16 and 7.50R-16 sizes with values such as 10.17 and 9.80 revs/mile, footnoted for F-Super Duty motorhome chassis with a conversion constant of 1.0.

AI caption July 2011 · Photo 107 of 221