Any help? Sounds like you want to generate electricity from your bike wheel and use this to light sequential LEDs. If that's correct, you have too many variables to do the calculations from scratch (generator output per rpm, pulley/gear ratio, etc). Eliminate the variables. The first thing you must do is mount the generator to the bike, go 1 mph (clock your speed with a car or a manual spedometer), measure the voltage output with a standard volt meter, and write the voltage value down. Increase your speed to 2 mph and write that value down. Continue until you have a chart of values. Use this chart to design your LED circuit.