.61- 13*4 to 14*4 range
.75- 14*4 to15*4 range

I havn't actually flow those motors, and it is all dependant to what airframe and the amount of thrust you are wanting.
I run an 11.5*4 APC wideblade on a .46pro, and a 12.25*3.75 APC wideblade on an xls .52.
A good general rule is to look at manufacturers prop chart and go to theLargest diameter prop and use a pitch of half the diameter (or a little less).