I was wondering how to figure out what size replacement runner I would need, I don't need any yet but was wondering. How often do they need to be replaced / sharpened? Also, is anyone familiar with the rocket runner on the CCMs? These are the skates I got...Size 8. http://www.hockeymonkey.com/ccm-hockey-skates-vector-u-plus-pro-sr.html This is my first pair of ice hockey skates so I'm not familiar with runners at all.... When I am skating my left skate feel fine, but it the right one seems to bite into the ice at times and it feels like I am fighting it. Is it my form, or could it be the blade wasn't sharpened right or I got a nick in it?