Shimano dura ace hg901 11 speed chain shimano's top end model, this dura ace road bike chain will ensure your 11 speed drivetrain operates smoothly and shifts cleanly. Low in weight and highly durable for those who spend many hours in the saddle, it has shimano's hg ev technology to enhance your gear changes even further.featuresmaterial zinc alloy plated inner and outer linkschain width 5.62mm  use road  adjustable yes  included chain, joining pin  compatibility 11 speed drivetrains  quicklink no  optimised for 11 speed super narrow hg ev drivetrainsouter plate design has been developed to reduce the chance of chain sucksil tec surface treatment technology ptfe plating on inner and outer links and rollers that is smooth running and increases durability  hollow pins for added weight savingthe inner plate has been developed for better contact with gears providing smoother shifting under high load, giving efficient pedalling, increased rigidity and near silent running  weight 243ga 2 year warranty is offered with all shimano products from chain reaction cycles 3 years on dura ace and xtr products.buy shimano components from chain reaction cycles, the world's largest online bike store.