SRAM DM Drop-Stop B Chainring - BoostOur direct mount chainrings for SRAM cranksets replace your existing spider and chainring with one clean looking, lightweight, and stiff piece of machined billet. They are available in 3 different offsets: standard 6mm offset, Boost 3mm offset, and BB30 short spindle Superboost 0mm offset. This chainring has a 3mm offset to suit Boost drivelines. These direct mount chainrings will replace your existing chainring and spider or replace the direct mount