well first off you cant use your derailleur with a setup like that. Dimension Edge and Staton have both done what you are trien to get done. I am the son of the owner of Dimension EDGE and know first hand how dangerous running an engine through your derailleur can be. I dont have the time to explain how it all happens but your derailluer will end up in your spokes if you keep it the way it is... our fix for that situation is just using an internal shifting hub.
Sorry i couldnt go into more depth but i posted this at work so gotta go.
I would love to hear more. I admit I don't have a lot of miles on mine yet but if my physics is correct there is a lot more force exerted by a 200lb body at full force against the cranks than a little motor can generate. The motor has the advantage in RPM not torque.
That is so cool Pablo ! Can you still have the pull start put on the engine ? How is it at hill climbing and speed ? Do you use the clutch for anything ? What is your anticipated availability date and cost ?
Your quote "29t rear sprocket to a 58t and everything in between"
Save one for me please!
How much. Will you sell pieces.
For example crankshaft sprocket now. Jackshaft,brackets,and chain later.
I was going to try a rack mount, BUT I will wait for this!!!!
Last edited by spad4me : 03-19-2008 at 12:38 AM.
Reason: clarification
Before i get into this i am not trien to argue with you on this subject. just letting you know what problems we had.
its not about the torque applied, its the pulses of torque applied that launches your derailluer. not to mention the torque you are producing at the wheel from the engine is much higher then you might think. you have alot of gear reduction going in in your set up. the gear reduction in the diferential used 7:1 reduction (i could very easily be wrong on this).
The derailluer worked fine for many monthes(this bike was my rider at the time). but one fateful day at the sturgis bike rally, i was climbing the last hill into deadwood from sturgis when suddenly my rear wheel locked up. i somehow kept the bike from going over and when i stopped i noticed about 1/4 of my 12 gauge spokes snapped, and what was left of the derailluer was intangled in the remaining spokes.
We took that same bike, got it a new rim with a nexus 8 spd internal hub and the thing still runs today. i am just trien to let ya know that expecting your derailuer to handle all of that is just asking for trouble.
Mirk,
I appreciate the insight. I don't claim to know everything and again don't have a lot of miles on my prototype yet. It is definitely something I will keep an eye on. If you don't mind me asking what exactly failed? Did the hub break? Did the freewheel mechanism fail?
From a business standpoint, I think that this decision should be up to the customer. Whether they use a standard derailleur, an internal or a NuVinci will be up to them. At least this gives them the option of both gears and type of rear hub they use.
Re: Eliminating the driven sprocket 
Linear Mode
