What bearings do speed skaters use?


What bearings do speed skaters use?
Most speed skaters opt for a rating of ABEC 7 or ABEC 9 to maximize their performance. Other types of bearings, such as bearings made from ceramic or Bones bearings, are regarded to be as good as ABEC 7 and ABEC 9 bearings. Speed skate bearings can be lubricated with either oil or grease.
What is the fastest skate bearing?
What bearings are good for speed?
Is ABEC 7 or 9 better?
Do I need 7mm or 8mm bearings?
Does ABEC 11 exist?
Speed skating takino bearing for national and international 
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