My favorite part about the Turbospoke:

"On an episode of the TV show Braniac in the UK, a kid wanted to know if he was faster or slower with the turbospoke attached to his bike. So they set up a little circuit for him to pedal around with the thing on/off. Realisticly it should slow him down, but the result was that he went faster with the thing on, and what they figured is that it was psychological in speeding him up (with the "vrooom" and all)."

Now if only someone would make a spoiler then we could get into some serious modding.