Surly Big Dummy Rail Collars S3-Cat-Components&Parts-Chainrings-MountainChainrings-DirectMountChainrings the new design of the

the new design of the Campagnolo 11™ chain increases the shifting performances and reduces the noise of chainring and sprocket engagements

No damage to bike parts

Swings away from car with bikes loaded to provide easy access to rear of vehicle

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Surly Big Dummy Rail Collars S3-Cat-Components&Parts-Chainrings-MountainChainrings-DirectMountChainrings the new design of theSURLY BIG DUMMY RAIL COLLARS These tiny little pieces of hardware are designed to vastly improve the overall performance of your Surly Big Dummy. These simple clamps are designed to strengthen the interface between Surly Dummy Rails and the lower longtail frame. Cool huh? Please see the attached resource below for more info instructions.