With steel rims I think people used to bung them in a vice with blocks of wood. Not sure if your atlanta will like that though.
A rapid juddering could be caused when your brakes are perhaps applying unevenly, and/or your forks are flexing. Sounds like a road bike though so I guess your forks are designed to be braked with. A bump-bump-bump, one per wheel revolution, will be 'cause of what you say it is.
With steel rims I think people used to bung them in a vice with blocks of wood. Not sure if your atlanta will like that though.
A rapid juddering could be caused when your brakes are perhaps applying unevenly, and/or your forks are flexing. Sounds like a road bike though so I guess your forks are designed to be braked with. A bump-bump-bump, one per wheel revolution, will be 'cause of what you say it is.