My electric build - SUCCESS!

[MitchJi]

Hi,

You might try these for pedal interference:
http://www.kneesaver.net/

Kneesavers ™ are custom pedal extenders which are designed to be placed on your bicycle between your bike pedals and the crankarm...

...These clip-less, case-hardened steel pedal adaptors come in 20mm, 25mm and 30mm widths.

If you are willing to build some gear reduction you could use a small RC Motor for a narrower setup like this:
Images:
http://endless-sphere.com/forums/download/file.php?id=17510&t=1
http://endless-sphere.com/forums/download/file.php?id=17508&t=1
Build Thread:
http://endless-sphere.com/forums/viewtopic.php?f=28&t=7791

This is the motor he used, under 2 lbs and easily sustains 2,500 Watts (only about 2" long!):
http://www.astroflight.com/index.php...jkk1ih41ovcdm4

Typical Power Range ------ 2,000 to 3,000 watts
Typical Efficiency ---------- 90 to 95%
Motor Diameter ------------ 3.2 inches
Motor Length --------------- 2 inches
Motor Weight --------------- 32 oz.

For the crank for a through the gears system you can use one of these (better to replace this FW with a White Eno 22t):
http://www.bikepartsusa.com/bikepar...-System,-39x1.75,-Front,-Crank&category=crank

Here is some relevant experience with the performance improvement of using the bikes gears (1/2 the power and better performance):

Anyway, with a 55A controller limit, this setup peaks out at about 2600W, but because of the gearing benefit of going through the 3-speed hub, this combo actually outperforms the 24s4p 72V 5303-based setup with a 4110-modded controller set to about 65A (4,680W).

This surprising performance "boost" by taking advantage of the bike's gearing has started me on this quest now, to convert all my bikes to similar weight-saving configurations.

Build thread for that bike:
http://endless-sphere.com/forums/viewtopic.php?f=28&t=8035