One of the slight drawbacks to running a 1x11 drivetrain is that you lose some top speed. However, with this expander sprocket on board, you can run a 34T chainring up front for extra speed on the flat, without losing the low gear range for the climbs. Smoother Gear Transitions In addition to the larger and easier climbing gear, OneUp provide an 18T hardened steel sprocket, to help to smooth the