Originally Posted by
Jmuck69
What ballcups for the B4.1 would provide tighter tolerances. Just seems to be too much slop with the stock units. I have seen pics of Kinwald running the Losi grey extra rigid ballcups. Would RPM betighter?
RPM is tighter, stronger, and last longer. Stock ball cups dont last long in the cold winter indoor months because they get to brittle.

I never have run the losi ones.