Tranny comparisons for frame mounted motors

[Zomby Builder]

Nirve build

I have made a smaller sprocket to fit the 5 to 1 tranny. It is made by turning down a stock one to 5/8 inch & tig welding it inside a standard 8 tooth by 5/8.





I want to build a Nirve with a NuVinci too. I would like to mount the motor centered in the frame. Only thing is The Honda 50 with adapter & 5 to 1 measures 12 3/4 inches. To do this & use the freewheel crank that (you) Scooterguy have had so much success with. Crank arm clearance needs to be W-I-D-E. I suspect you have thought of this too. Any reasonable solutions to this issue???

 

[thescooterguy]

i just mount the motor

. the motor mounts up above the path of the crank arms . i have some better pics of the nirve . im not on my computer i will get them in a bit

 

[thescooterguy]

this was a specialized i made last summer , you can see how far forward the motor is ,
http://i480.photobucket.com/albums/rr161/thescooterguy/specialized013.jpg
http://i480.photobucket.com/albums/rr161/thescooterguy/specialized024.jpg

i use the 8mm chain for becouse the choices of drive sprockets are endless , 11t 14t 17t and 20t , also for large chain rings you get three choices , 54t 63t and 74t , and then for the final drive chainring you can use a 22t or 24t . and you can get them all at the local bike shop , get the 64mm bolt hole spacing , it all lines up , here are some pics .
http://i480.photobucket.com/albums/rr161/thescooterguy/freewheelspecial001.jpg
http://i480.photobucket.com/albums/rr161/thescooterguy/freewheelcrankinstructionpicture-10.jpg

and here is a electra townie build , plenty of room for pedaling , the nirve is even longer , i still havnt replaced my camera that i lost on my cross country bike ride last summer iwill have great pics of the nirve after christmas , hopefully.
http://s480.photobucket.com/albums/rr161/thescooterguy/?action=view&current=townie2001.jpg

 

[thescooterguy]

new camera for christmas

the nirve build on video
http://www.youtube.com/watch?v=fFbTx-85XIk

 

[77shovelhead]

This has been a great thread! Thanks for all the excellent info.