Improving the Efficiency of Electric Hybrid Bike

Will the small amount of electricity generated make up for the extra weight?
Regenerative braking is probably more effective....
Del

First, springs are a mechanical energy storage device themselves and they're pretty efficient, too. So to get the same ride that you originally had, you should not be trying to capture the energy lost from a spring. You should try to capture the energy lost from a shock absorber. But don't forget, every time you change one form of energy (mechanical, electrical, chemical, etc.) to another form some energy must be "lost" in an undesired form of energy. So you may end up finding that the added weight to capture your shock absorber energy burdens the rider more than the returned energy.

PS Please use the spell check feature. It won't cure poor grammar, but it will make it easier for us to understand you.

As others have said the weight will more than offset any negligible power generation gains you make. You can try building it, but it you will find the hybrid bike efficiency is always lower with it installed (you would be better off giving the passengers one of those shake-to-charge torches each and connecting them to the bike battery instead).

Best to look into other areas such as reducing the overall weight of the vehicle. Also see previous threads on CR4 that have covered the topic of hybrid bike and vehicle design(they have lots of useful information and website links).

Many years ago an inventor suggested to use on bikes oval wheels since according to him the adherence would be better. In your case this would generate more important vertical movements and allow a more important electric power harvest.

Years and years ago I had a bike called an "Ingo-Bike" that had round wheels, but the rear hub was off center. There were no pedals, you rode it standing up like a scooter and "pumped" it along by timing your knee bends with the eccentricity. That thing was LOADS of fun, but you couldn't go very fast.

Here is a picture of one.

I think it'd be interesting to somehow design that concept around an energy producing bicycle.

use a maget setup to run the lights from the spokes in the wheels. that will free up some power

Don't listen to the "It isn't worth it" crowd. If you think its worth your time, effort and money then it's worth it.

If you are looking at a bicycle and it already has shocks the thing that comes to my mind first is that those type of shocks don't have much travel, as well as the mass is very low, so it could be a little hard to get much energy out of them. I wouldn't think much more then one of those shake up flashlights.

Now if we are talking a motorcycle then I've read about how they are recovering shock energy hydraulically. You could use the shocks as a pump that would drive a motor and turn a generator. Same thing with the seat. If you used a system like that you could add regenerative braking as well. You could also do a full hydraulic drive system with the drive motor being a hydraulic motor that would take full advantage or your shocks and shock in the seat. It would be an interesting system if you could get it all working.

Good luck and if you need any advice on the hydraulics let me know and maybe I can help, I'm working on a hydraulic system for a car right now.

Capture 1%-2% energy by spending 30%-50% more money and adding more weight and complexity that consumes 20%-30% more energy?

If it's a home project, just go for it! Don't let silly things like numbers get in your way. If nothing else, it will be a great learning experience for you. Best wishes on your project!