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Pair of double sealed XT RD-M8000 pulleys Shimano. They will be ideal to update your XT 11 speed transmission after a good season, between 7000 and 8000km.These new rollers will bring a new youth to your rear derailleur by bringing more fluidity and precision.Our advice:To optimize the operation of your new rollers, changing the chain and cassette at the same time will be essential!Add some lubricant provided for this purpose and you're off to a better start.DETAILS :Group: Shimano XT RD-M8000Double sealedDyna-Sys IISpeeds: 11Pair with a top and bottom roller