I just installed a new front disk brake and the rotor rubs a bit once per rotation. If I take the rotor off and place it on flat surface, it seems totally flat but once installed I can see/hear it rubbing onto the installed disk brake caliper once a rotation. It's enough friction that it's making the wheel stop spinning pretty soon compared with when spin it with the brake off(not sure how to quantify it)
Is this normal?
(The new brake is an hydrolic Avid 7 Elixer and it replaced the original (also hydrolic) Avid 7 Juicy that came with the bike. It's the original rotor. The fork is a Lefty and therefore there's not any adjustment to be done on the wheel.)