Renthal Duo Stem: 50mm, +10 degree, 31.8mm, 1-1/8", Black/GoldRenthal's revolutionary Duo stem combines high strength with ultra low weight. The stem is horizontally divided, allowing it to be machined in two pieces. This method gives unrestricted access to the stem core, enabling weight to be reduced to the absolute minimum, without compromising strength. Split stem design for maximum weight reduction CNC machined from 6082 T6 aluminium alloy U shape cradle clamp eliminates handlebar stress risers found with