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Compatibility These rings are for use with 110 BCD 5 arm cranksets. Stock 2x bolts will not work. You will need bolts like our 6mm bolts which are optimized for single ring mounting. Chainline - varies - these rings can be mounted in either the big or small ring position on a double cranksets. The most common mounting is in the big ring position because of chainstay clearance. The ring centerline is ~2mm from the ring's mounting face so they usually sit about 2mm closer to the frame than the stock big ring (depends on the stock ring)