Raced yesterday w/ our club. We had a Tamiya mini competitor join us (he's competed in TCS Mini events at the LA track). I've raced with him in the past, super great guy. I feel my Mini is dialed in ...or at least on a scale of 1-1000 it dialed in to about a 950 it's pretty much there. His is just a tad more dialed in though, for example he showed me how his rear tires could spin for like 1/2 a minute when spun w/ his hand. ...he spun his tires and they just kept going. I believe I may have a tad bit too much friction, as my tires do not spin quite like that.

Is there a specific bearing that is preferred for the rear tires (and internal gears)? Is there some trick to get the wheels to spin for a long long time and remove most friction? I don't use any grease on my internal gears ...just a very light spray of thin silicone oil. -is that bad??