When replacing broken bearings with new ABEC 3 or ABEC 5 bearings I find that the bearings end up slipping on the axle that they run on or sometimes the outside of the bearings can also end up rotating depending upon the tolerance of the plastics / aluminuim that they go into. This can show up on black axles as two very shiny rings. I usually use some Locktite bearing lock or a VERY small amount of tyre glue to build up the axle or outer edge of the bearing to make sure that there is a proper friction fit. This also helps make the bearings last longer as if dirt does get in then the bearing is still kept moving rather than being allows to lock up and sieze. Building the car like this means there is a lot less slop especially around hubs. Answer RC bearings also have one side which are metal and one side which is rubber shielded which means they are the best of both worlds when it comes to friction. I always used to take one rubber shield out on my old CAT XLS to get the best performance that I could as capacity back then was at a premium.
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