Meh... I bought "the ultimate concept" when I first came to this site 3 years ago.
http://motoredbikes.com/showpost.php?p=322210&postcount=5
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Folding 20" bike w/ 5:1 reverse gearbox rack-mounted to a dual freewheel hub, both freewheels being on the right-hand side, connected to 12 gauge spokes or thicker.
My engine freewheel looks just like the others in this thread. In order to get it off, I had to grind it off. I'm thinking of putting a shim plate on the inner side of the engine freewheel this time, so that it should be far easier to remove if needed.
Also, if you ever need to replace your engine freewheel for whatever reason, that larger sprocket (44t) will slide right on a regular 16t freewheel, and those 4 bolt holes will line up perfectly with the spokes of the regular freewheel. 16 / 4 = 4 perfect holes for those bolts to go thru.
Very, very awesome design, indeed.
I could have gotten the Grubee dual freewheel hub, but the engine freewheel is on the left-hand side!!! That doesn't allow me to use the SUPER compact 5:1 reverse gearbox, however... which is a huge bummer. Also, flipping the engine around would put the intake in the rear of the bike.
I feel like this configuration adds an extra mph or two w/ the intake being in the front and the exhaust being in the back... like the Honda K-series motors.
Love it, love it, love it.
Too bad somebody doesn't have a bunch of these wheels pre-made for 20", 24", 26", etc. bikes.
Design a wheel around this hub, with 10 gauge spokes, with a double-wall rim, etc... and then nearly all the pains of motorized bicycles will go away.
Seriously... if someone could make a solid steel wheel with this hub... in pre-made configurations... they would each be worth a few hundred $$$ in my opinion.
Just add tube, tires, bike, & engine/gearbox combo (that gearbox can be had for $20 or so).... and all of a sudden I see motorized bicycles as a reality for the masses.
Don't understand the benefit of CVT if we both reach the same top speed. I can carry this thing up 3 flights of stairs if need be.
THE HANDLE on my folding bike made this bike the ultimate configuration, as well, but it fell off after carrying it up so much. The aluminum was too thin at one part and cracked. But that flat plate w/ handle was something else. Still a handle on the frame for me to carry it up, but the one on the engine plate was soooo convenient.
What an awesome bike I have.
EDIT: Take note of the engine chain tensioner, as well. Very, very simple and solid.