Box four 8 speed polished chainideal for mountain bike riding, this 8 speed chain gives you fantastic torque strength and speed on every mtb ride. This model employs an 8 speed platform in a similar strategy to the prime 9 model but at a great value price point. It features a polished construction that is then chemically treated to achieve corrosion resistance. Box has also engineered the inner link spacing to be a little tighter than other 8 speed chains as well as optimising it for use with the box four wide narrow chainring.faqis the box four prime 9 chain compatible with other 8 speed drivetrains? Yes, the box four prime 9 chain has standard external geometry that will work with most existing 8 speed drivetrains.is the box four prime 9 chain compatible with any wide narrow chainring? No, we make a wide narrow chainring specific for use with box four 8 speed drivetrains.how should i clean my box four 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 speed 8 speed durable hardened solid pins wide narrow 8 speed specific compatibility box four 8 speed shifter black box four 8 speed wide rear derailleur black box four 8 speed 11 42t cassette black box four 8 speed wide narrow chainring 104bcd 32t black weight 364gbuy box components from chain reaction cycles, the world's largest online bike store.