Taken off some old longboard forum:
The best bearing by design right now is the Super Swiss 6 by Bones with SpeedCream. The Bearing had several advantages. 1) It is manufactured by WIB Bearing. 2) They are made with a tight Raceway curvature to avoid "Excess Axial Play" 3) They are supplied with a Re-enforced plastic cage rated at 150,000 RPM 4)Laberinth Non-Contacting Rubber Seals to keep out dirt. This is the obtimum design for free rotation and keeping out contamination.
Ceramic Ball Bearings are only good if they come with Plastic or Phenolic Ball Cages. As a Hardcore skater skating 4-5 days a week. Super Swiss 6 with Speed cream cant be beat. Fuc* the Abec rating. The Abec rating is designed so that the bearing has manufacturing consistancy in order to manufacture mating parts to simular tolerances. (Re: Precision Shafting and Housings.)
Ron
Oh Yeah
... one more note on why the Super swiss 6 has lower starting and running torque (This is Known as Speed to us skateboarders)
All 608's are made with 7 ball compliment. The Super Swiss 6 is the ONLY 608 manufactured with a 6 ball compliment. The Balls all bigger, can take higher load (Impact), Have less ball surphase touching the raceway with 6 balls instead of 7 which lowers the running torque of the bearing making the bearing get to full speed quicker. I am sure within the next year you will start seeing more 6 ball designs, but right now its WIB(Bones) that makes 'em...At all possible, stick with German or Swiss with Plastic or non-metalic ball cages. Any bearing with a steel cage will be slower no matter where it's made. Grease is just an oil with a thickener, the thickener in the grease will slow down your bearing and running just oil will attract contaminates from far away and not provide proper protection. Use the Good-old Speed Cream in the skate shops. By buying German or Swiss what is important is you will know the bearing is manufactuered by a very high quality bearing manufacturer who does the final raceway polishing what the chinese dont, and who it is. There are so many names and marketing stratagies going on with Chinese Bearings, you will get lost in it all. At my old Company we brought in Chinese Bearings for .12 Each. We had the Stamping machines to Mark the Shields. We did PIG,GIRL,SPEED DEMONS, and several others. All were from the same manufacturing lot with different color/marked shields. Any of those weird brands are probably a .12-.18 cent bearing made by the millions with no quality control and several key manufacturing processes left out in order to sell the U.S. for .12 cents.