The gmaxx looks okay. Let us know if the replace the arm or not. Hope the down time is not much. They can leap it off 30 foot cliff and you hit a 6inch curb. Go figure.
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Titanium will absorb some impact, but, make the material to thick and it won't. Take the GA 3,5mm titanium skid's for instance, if you hit a curb dead on at 35 mph I bet that they will break at the bulkhead. It's to thick to absorb an impact.
It is still impresive to break an titanium arm. Well done.