I have similar motion on new to me, used Zipp101 rear wheel. I had to open the release on the rear brake to keep it from hitting when ever I put power into the pedals. I can move the wheel laterally from brake pad to brake pad. Just had the wheel tured & tensioned with the freehub off, so will have to look at the bearings too. Where do you look in the casette or free hub to see if anything is broken? Thanks, Andy