HOLLOWcage has a carbon polymer monoplate construction with custom oversized full ceramic bearings and silencer pulleys.

Special xring rubber slings cushion the impact of the chain on the idler teeth, thus eliminating engagement noise.

The single disc cage can dynamically adapt to the angle of the chain, allowing the cage (and therefore the lower pulley) to better align.

Adjustable spring tension allows you to adjust the size of the cassette and the length of the chain to find the lowest tension possible.

Box Includes: Full Cage, Lock Ring Tool, 2 x Spare Ring Rubbers, 14ml GRAPHENlube.

Compatible with Shimano Dura Ace 9100/9150/9170, Ultegra 8000/8050. Fits cassettes up to 32T