what size tire should be on the FDR 3590 ? It was poor design to only allow 13x5 tire it should of been 15x6 to allow extra height. Mine is all the way up for a 4 inch cut. Poor design in hubs with cast instead of steel. Bar and spindle breaks all the time because of the bolt going in the bottom of the spindle. Have spent 2,000 dollars on this poor design mower. Had I been allowed to raise it up another inch would of saved me all kinds of problems.