The direct mount chainrings for SRAM cranksets replace your existing spider and chainring with one clean looking, lightweight, and stiff piece of machined billet. Compatibility This is the Boost offset model: 55mm chainline, 3mm offset. These direct mount chainrings will replace your existing chainring and spider or replace the direct mount ring on SRAM cranksets including the DUB cranks. The ring is attached via 3 bolts on the back side of the spider near the spindle. These chainrings are NOT compatible with SRAM 8-bolt direct mount cranksets. Compatible with Cane Creek eeWings cranksets. Wolf Tooth’s patented Drop-Stop® wide/narrow tooth profile for the ultimate chain retention and mud shedding ability. Made from 7075-T6 Aluminium. Made in USA. Tooth Profile Product weights: 26t - 52g, 28t - 59g, 30t - 65g, 32t - 70g, 34t - 75g, 36t - 81g