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Stick the big weights on the pedals
It's one ballast sphere, and it has to go in the frame.
If you wanted a flywheel, the rim is the best bang for your buck, see Mavic Comete +/- and Sosenka's heavy wheels for examples of when it has been done in the past.
gbj_tester
Stick the big weights on the pedals, once you're up to speed you get extra flywheel effect, or up your bum.