Okay, here's my idea. You know how your bike computer only registers speed with a certain delay, because the magnet has to pass the sensor? I'm thinking about putting on another magnet and changing the wheel size in the computer to make it register faster. It'll also balance the wheel a little more if it matters.
The way the computer calculates the speed is using the circumference, so if I double the value in the computer, it should work, right?