Alchemy led their booth with the new Oros, their first carbon fiber mountain bike. It uses a trapped rubber molding process to achieve its big, bold shapes without compromising fiber compaction.
Like all of the molds for their other bikes, the Oros’ metal mandrels are made in house. They’re then wrapped in rubber and, after the frame is cured, the thinner metal mandrels can be pulled out, then the rubber becomes loose and can easily be pulled out.
The benefit of this method is that they’re able to get better pressure distribution on much more complex shapes. It also lets them create larger parts of the frame as a single piece. On the Oros, the top, head and downtube is a single piece. The bottom bracket cluster is one piece, the seat tube cluster is one piece, and each side of the rear, from seat stay through the dropouts and up the chainstay is a single piece.
Those pieces are sleeved, so they’re slotting together like tube to tube bikes, but then they’re overwrapped for increased strength.
All of the mandrels and tubes/sections are made in house. Even the rubber parts are cast in house, giving them complete control over the finished product’s shape and ride qualities.
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