Shimano alivio m430 octalink triple chainsetgreat value tough and stylish mega 9 alivio chainset offering slick hyperdrive shifting performance for off road enthusiasts please note bottom bracket is not included features hyperdrive sg x chainrings for fast and smooth gear shifts replaceable chainrings 4 arm 443222t chainring combination 9 speed compatible chainrings octalink spindle fit for increased rigidity for use with 118mm octalink bottom bracketsa 2 year warranty is offered with all sh