The Duo consists of a
large Chainring and a small chainring. The Duo can be setup
with either RS7 cranks or RS8 cranks. No spider is used in
Duo crankset. The small chainring directly mounts on the crankarm.
the large chainring mounts onto the small chainring.
Middleburn's Strongest
crank that comes with lifetime warranty against defects in
materials or workmanship. Participate in any competitions(Downhill,
dual slalom or trials) or simply jumping around, if you were
to break one, it will be replaced.
