So if I'm understanding the chart right 50 would be "faster" than 75? I should have stored it in my cell phone when I got it done, hopefully the same guy will be there today. Another problem that may come up if you diecide to switch is some places still don't do the FBV. I play in 2 different cities, one rink does it the other doesn't so I have to wait until I play in the one rink to get it done. It is worth the wait. I felt a noticable improvement in glide, no loss in bite, no problem crossing over, no problem transitioning from forward to defense.