SRAM is rolling out an expansive range of direct-mount chainrings for its 1×11 speed drivetrains.
These CNC-machined aluminum direct-mount rings offer two important benefits over the four-bolt design employed thus far on XX1, XO1 and X1 cranks: increased gearing range and decreased weight.
Curiously, SRAM opted to use two different bolt circle diameters for its three 11-speed mountain groups. The top-tier XX1 group uses a 76mm BCD, allowing riders to go as low as a 28t chainring. However, the 94mm BCD used on X01 and X1 limits the smallest chainring size to 30t.
The new sram direct-mount x-sync chainrings are compatible with xx1, x01 and x1:Courtesy
The new direct-mount X-SYNC rings are compatible with all of SRAM’s 1×11 mountain groups
This direct mount chainring option is compatible with XX1, X01 and X1-level cranksets and allows riders to select from a much broader range of tooth counts — everything from a climb-friendly 26t all the way up to a quad-killing 40t ring.
The second important benefit of SRAM’s new direct-mount rings is a reduction in weight. The claimed weight savings of the direct-mount rings ranges from 25-50g, depending on chainring size.
One downside to this direct-mount approach is that — since the chainring bolts directly onto the crankarm spindle — the chainrings must be offered in dedicated versions for cranksets with 24mm (GXP) and 30mm (BB30) spindles in order to get achieve the proper chainline.
SRAM will offer its direct-mount x-sync chainrings in even tooth counts from 26-40t :Courtesy
To view a compatibility chart for SRAM’s new direct-mount chainrings click here.