This carbon fiber monocoque frame bike is the product of three
mechanical engineers senior design project. It took them around 4 months
from design to completion and around $4k (although they admit they
could of saved a lot of money and time if they'd found the
endless-sphere forum sooner.)
The electronics themselves are actually pretty standard: RC lipo and a BMC geared motor. It's the frame itself that warrants attention here! The total bike weighs in at 90lbs with the monocoque custom made carbon fiber frame only weighing 9lbs.
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Custom made swing arm ~2.5lbs
The bike is setup to provide 9.5" suspension travel front and rear. That's pretty awesome. It helps the they fork is off of a CR80. I really like the idea of using an overbuilt motocross fork that cost under $500 and can go years with out maintenance over a $2k DH bike fork that requires maintenance every 30 hours. Of course the difference in weight between the two is around 15-20 lbs.
Try this on your wal-mart bike.
They have quite a few vids of this bike running trails on youtube.
For more info on this build see the original forum thread.
What has this team been working on since? Well, they've renamed themselves "Phasor Cycles" and this is their in progress Mk 2: