Hydrogen Is the Middle Man
Why use electricity to generate hydrogen, then use hydrogen to generate electricity to power the bike?
Why not just use electricity to power the bike? Replace the fuel cell with batteries. Replace the hydrogen distribution network with a receptacle in your garage.
The latest generation of phosphate-based lithium-ion batteries weigh less than lead-acid, have greater capacity, charge in less time, and have longer range.
They're already being used in laptops, wheelchairs, golfcarts, and the latest generation of the Segway, which has twice the range of the original.