has been discussed before. assuming your front wheel does not have any downtube clearance issues, use a hollow starnut, with an aero brake (the kind that will fit behind the fork. braking force is reduced compared to a traditional setup, but you can still do barspinz. a friend has this setup around town because if a cop wants to be a dick, he can give you a $120 ticket for not having a brake and it can also go on your driving record as a moving violation. and he loves his barspinz.