maybe there is something already posted somewhere on the forum, put I can't find it. how to use these speeds when putting....havent played a lot lately,so my putting sucks.....can anuone explain this to me on how it works and apply it when putting.. thanks
There's no real change, they only gave numbers from 7 to 13 to the different speeds which make small variations visible, like 12.3 and whatnots.
Look for stimp meter in the search for more details.