I have done a track day and nobody was bothered about it. I'm not 100% on this but I'm sure they are made from polycarbonate which is super strong it's what they make riot shields and safety impact screens from. If I remember correctly the window is approx 8-10mm thick.
In all honesty the original cast alloy cover is probably the same strength as the ducabike cover. They do sell little protection plates but it does cover it up a little.
I have the R&G frame bobbins on mine. Just in case the bike ever does go down.
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