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How to mount 110/4 absoluteblack Oval chainring to Shimano Dura-Ace 9000, Ultegra 6800, Shimano 105 5800, Tiagra 4700 First you need to remove crank from the bike. Once removed unscrew 4 bolts that hold two rings together with T-30 torx key. Take off the original small ring and replace it with Absoluteblack oval. Please note that small indicator on the ring should fit behind crank arm - same way as original chainring indicates its position. Close back those four bolts with force of about 5-7Nm. Mount your crank back to the bike. Done