I'm using Losi HD cups, and AE TC5 balls, (silver, and black), and have seen a definate improvement in performance, as well as durability. No stripping, no flex, no popping off. It's what the 410 is meant to be, now. I set the track record the first race after the upgrade.
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4PK, DEX408v2, DEX410 Pro, DESC410, DEX210v2
MOTOCROSS: Because Rollercoasters Are Too Slow!