Is this really worth it?

I added a rear disk brake to my mountain bike (non-motorized) with an A2Z adaptor. The disk brake helps a lot on muddy trails. I only ride my motorized bike on the street. I don't think the rear disk brake is worth the money and effort on a motorized bike unless it is friction drive or driven by pedal chain through a shift kit. It is a very tight fit with the motor chain and disc caliper on the same side.

For the front, looks pretty awesome Mike. Almost to inexpensive?

If you do get one, please review it. Could be a great option, me thinks.

I am running these on both my builds and they are great so far and pretty cheap. Last week they were down to $12 a wheel but you would have to buy or make a mount. I am also running the A2Z rear disc adapter. http://www.blueskycycling.com/product6711_70_-Funn-EZR-Mechanical-Disc-Brake-w--Rotor.htm