Ochain R is a 104 BCD spider damper that lets the chainring rotate rearward a few degrees, so pedal kickback and drivetrain noise are taken out before they reach your feet. This version mounts to a SRAM 8-bolt direct mount crank arm and takes any 104 BCD chainring.

Highlights

• Lets the chainring rotate rearward to decouple the drivetrain from the rider and suspension
• External Travel Adjust dial: Lock, 3°, 6°, 9° and 12°
• SRAM 8-bolt direct mount crank interface
• 104 BCD, 3 mm offset as standard
• SRAM-listed weight 178.9 g (spider)

Set it on the trail

Push the crank forward, pull the knob out and turn it to the setting you want. SRAM suggests 3° for smooth XC and trail riding, 6° for rougher trail and enduro, 9° for consistently rough enduro or park and 12° for the roughest DH terrain; Lock is there for back-to-back comparisons.

Service

SRAM sets an elastomer replacement every 100 hours and a full service every 200 hours or once a year. Both kits are available, and Tune Cycles can do the work in the workshop.

Compatibility and fit

Ochain R and N suit SRAM direct mount cranksets, and the 8-bolt version must match your crank arm's interface. It takes 104 BCD chainrings only. At the standard 3 mm offset SRAM lists 52 mm chainline with DUB or DUB SL and 55 mm with DUB Wide; a 3 mm spacer kit gives a 6 mm offset for DUB DH. Tighten SRAM chainring bolts to 9 N·m and recheck after the first ride.