LOWRACER INSPIRED DESIGN
CHALLENGE CNC STEM SYSTEM
The base of the System is a block which clamps
to the top of the fork shaft, to fi t all of Challenge´s
forks. Attaching to this with a smooth, play-free
pivot system is the riser, which is CNC machined
in a single piece. This is a highly stressed part
and welds might compromise its strength.
CHALLENGE CHAIN IDLER
Challenge´s new idlers are made of
injection-moulded carbon, and just
like carbon in graphite form, the
material has its own self-lubricating
anti-friction properties built in. The
idlers run on sealed bearings which
can slide easily along their axles,
allowing the idlers to adapt to the
chain position as you change gear,
minimising side loads. This reduces
noise and friction even further.
CHALLENGE FRONT IDLER
Challenge front idlers also slides along there axles to adapt the ideal chainline.
The rings are made from a soft material as Your legs are moving close along this idler.
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