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Carbon frames are a thing, but the manufacturers are having a tough time figuring out how to tune them effectively. Steel and aluminum is very well understood in the motorcycling world.
It's actually amazing how far ahead bicycle companies are. The focus on weight savings is amazing. The suspension development is right on-par with the best Motorsports items, very rare to find un-adjustable suspension. 2 way adjustable with preload is standard, 3-way is much easier to find, and 4-way rear shocks are finding a good foothold in the market.
Motorcycle companies seem to shy away from lightweight bikes. There's issues with cross-winds and big truck drafts, a lighter bike means more attention needs to be paid to suspension tuning. Lighter bikes also tend to pick up the front wheel much easier. That said, a lighter bike is worlds better in the hands of someone who knows how to use it. KTM seems to be the only major manufacturer who actively tries to reduce weight.
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