Crankbrothers cobalt 11 carbon 27 5 mtb wheelsetthe cobalt 11 from crankbrothers are pro level carbon wheels for everyday xc racers they feature a unique wheel design that is based around principles of strength stiffness and acceleration the unique wheel design distributes mass closer to the hub for faster acceleration and deceleration the wheels are tubeless ready out of the box as they feature no holes on the inner rim bed they are incredibly strong thanks to their twinpair spoke technol