I have a Trek Domane disc brake frame. I have Shimano 770 c30 disc brake wheels. The frame will get SRAM equipment. I put the SRAM centerlock rotor on the front wheel and locked it in place with a lock ring. When I check alignment, the disc lines up with the calipers just fine, but the lock ring which has been properly torqued, actually touches the inside of the front fork. Can anyone explain what is going on and what I have to do to correct it? This is holding up the entire build because I am baffled. Thanks

Are you using the kind of lockring with an internal cassette tool interface, or with an external bb style interface? Try taking it to a shop--they should have some spare lockrings they can try to see if any work, or you can try a different rotor (the caliper/pads will work fine with a Shimano rotor, for example).

The lockring that come with this centerlock adapter is thinner than the normal one and should work. I don't know if they sell it separately from the adapter.