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An Electronic motor that fits in the seattube, and engages the crank axle is the way to og
No, a wheel mounted motor in your disc is the way to go for TTs, you can put the battery in there too and if you use a torque sensor between your sprocket and hub shell you can get it to do regenerative braking into the turn and only use the power boost on the hardest parts, where the gain is most useful. Not that I've spent a lot of time thinking about this...
Off topic but could someone make a bogus bike computer with a powerful battery and with fake sensors connected to the wheels acting instead as an electric motor, repelling the magnet on the wheel everytime it gets past? Would it be any good in time trials?