I have been using a HW 60A 13.5T. The plastic center shaft seemed OK so far but I already broke a front knuckle, a rear C hub, a steering joint and deformed a crome plated rim so far. No direct full speed crashes, just occasional bumps. So I think the TT02 plastic parts are quite fragile. Now I tried to reduce their brittleness by puuting them into boling water and let it cool before using.
feel the TT-02 ride height not low enough despite set low ride height. i stick a small piece of magic tape on both rear downstop. on the front i inverted part A8. that shud futher lowet the ride height by 3-4mm