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I'd be surprised if Ecotech ever posts their spec, and it's entirely possible given their volumes and price that they specify a different than standard grease/above average bearing grade. If you have a sound that decreases when the screws are loosened it makes me think you have an issue with your assembly. I consider all of mine pretty well balanced, and very quiet when new (note, QD drivers. The non-QD ones made a bit of noise, although that was an electric motor noise not a bearing noise). I have found them to be very sensitive to alignment. In many cases mounting both the spacer (MP60) and cord (all of them) does wonders for noise and bearing life.
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