Folding bike with "non standard" geometry: Need motor.

[melodious]

I just bought an aluminum Tern P7i folding bike. It has 80mm front (aluminum) and 130mm (internal gear hub) back widths with 20" wheels. These aren't considered standard geometry. Are there any motor/wheel kits that are suitable for this bike without having to go into "modification" mode?

 

[amberwolf]

What about the GNG middrive kit? (are a few threads about it now)

 

[motomech]

The closest fit that I know of would be an Ananda Q100 geared mini-motor w/ a 7-speed free wheel,
which would have a "drop-out" width between 132 and 133mm.
Whether or not the Alum. chainstay could be spread those remaining few mm's, I'm not sure.
The "fast wind" 328 version would be a good match for a 20" wheel.

 

[d8veh]

Motomech, Q100 won't fit. It's too wide for the front, and he has hub gears, so can't put it in the back; however, the Q85 will fit in the front. It has to be the 328rpm version:
http://www.bmsbattery.com/front-driving/366-250w350w-q-85100sx-motor-e-bike-kit.html
Another alternative is the Tongxin or one of its derivatives for the front, which are 80mm wide. Be aware that the controllers from the supplier below have pedelec precedence, so you have to pedal to enable the throttle and some of their controllers don't have throttle. you can get a KU63 controller for it drom BMSBattery.com, andyou'll need the multi-pin cable to go with it.
http://www.keyde.com/?do=product&lang=en&event=view&ids=07

The smaller GNG crank-drive kits should also be a good solution because your chain-wheel doesn't look too big (unlike the derailleur gears versions). They're fairly simple to fit, but a little noisier, but will climb better and give a higher speed.
http://www.gngebike.com/apps/webstore/products/show/2847062

 

[chvidgov.bc.ca]

Crystalyte 209 is a nice fast wind small hub motor good for Dahons and other folders with narrow front spacing around 80 mm. I got one from itselectric.com in Calgary. Very quiet.

 

[melodious]

So far this is what's at the table:

1. http://www.bmsbattery.com/front-driving/366-250w350w-q-85100sx-motor-e-bike-kit.html
Higher RPM version for 20" wheels w/80mm fork width

2. http://www.bmsbattery.com/controller/188-hall-sensorsensorless-250watts-brushless-hub-motor-controller.html
36V controller

3. http://www.bmsbattery.com/accessory/231-thumb-level-throttle.html
Thumb throttle

All from the same site. :lol:

I'm guessing purchasing a battery/charger combo is somewhat hazy from what I've heard as the means of delivering them via "overseas" has changed. I'm borderline committed to going the DIY RC lipo route as I've not done one before. I am, however, a little more adept at battery knowledge these days ever since joining these type of forums. I even purchased a DMM to learn more.