I got my crash knobs from www.rapidartnz.com and they worked a treat in my recent off. The frame did not touch the ground at all, even the radiator was untouched. The knob itself was ground down about 20mm and the securing bolt was slightly bent. They were not stunningly cheap to buy but worth every cent when it counted, although to be fair I wouldn't be able to vouch for how they would work in a high speed off. Every accident is different I guess.
"Twilight's like soccer. They run around for two hours, nobody scores, and a billion fans insist you just don't understand"
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