Box three prime 9 speed polished chaindeveloped for mtb riding, this 9 speed chain offers incredible torque power and speed on the most challenging of mountain bike rides. This chain is polished and then chemically treated to achieve a level of corrosion resistance. All prime 9 chains have chamfered shifting edges, solid plates and solid pins to safeguard durability. Box's unique inner link spacing is engineered to grab those modern wide narrow chainrings. Box also chose to modernise the 9 speed platform due to the chain's spirited reputation.faqis the box three prime 9 chain compatible with other 9 speed drivetrains? Yes, all box prime 9 chains have standard external geometry that will work with most existing 9 speed drivetrains.is the box three prime 9 chain compatible with any wide narrow chainring? No, box prime 9 chains are compatible with most 11 speed wide narrow chainrings but there are some chainrings that can result in poor performance. We recommend the following 11 speed wide narrow chainrings for best performance, wolftooth components, raceface, one up components, absolute black.how should i clean my box three prime 9 chain? We suggest removing the chain from the bike and using a soft bristle brush or rag with soapy water or a mild degreaser. We do not recommend pressure washing, strong solvents or de greasers as they could degrade the surface coating.features material hardened alloy steel use mtb durable hardened solid pin prime 9 technology compatible with modern wide narrow chainrings compatibility box one prime 9 11 50t cassette black box two prime 9 11 50t cassette black box three prime 9 cassette black box one prime 9 rear derailleur box two prime 9 x wide rear derailleur black box three prime 9 x wide rear derailleur black box one prime 9 shifter black box two prime 9 shifter black box three prime 9 shifter black weight 312gbuy box components from chain reaction cycles, the world's largest online bike store.