Box One Hub Lock Ring
Extruded and CNC-machined from 6061-T6 aluminum, Box One Hub Lock Rings are lightweight and beautiful. Replace that old steel lock ring you have now and save some weight while adding style and color to your whip. Available in anodized red, blue, gold and black to fit Shimano-compatible cassette bodies. Keep in mind, aluminum is softer than steel, so use care when installing one of these lock rings.
To install the lock ring, use Park Tools HCW-5 Bottom Bracket Lockring Wrench. Please note, Park Tools BBT-18 is not the proper tool for this lock ring.
The lock ring should be installed with the larger, slotted side facing the cog and the smooth side facing the dropout.