In the year and a half I've raced my 511 I've never broken a high traction arm, despite some heavy cartwheels at the last race after wheelying at 60mph (40-50m bumpy carpet straight). It has always been the upright/steering arm that has broken in unison. Neither have I broken shock tops, roll bar mounts or hinge pins, so I'm a little at a loss at how you can break these parts so frequently.
I race the HT arms and will continue to do as they're, in my experience, nearly unbreakable.
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