1. The ceramic ball has a great advantage, mainly because the ceramic is harder, like the tires that are full of gas, the rolling resistance is smaller.
2. Select the appropriate lubricating oil, in general, the oil should be thinner, not too thick or too much, can not be added, or a long time will cause damage to the channel. If grease is used, the effect will be much worse, and the thickener inside will have too much resistance.
3. Choose a small bearing, 606 in the same condition under the same conditions is of course better than 608 and 188 bearings, because the bearing is small, the internal contact area is smaller. But it can't be too small. If you choose a rice-sized bearing, no one can control it.
4. The cage inside the bearing should be selected nylon, the metal friction coefficient will be relatively large.