It is certainly a clean looking bike, but to me it looks like they are basing the build off a $200 Greenline aluminum cruiser frame:
Some of the gas bike guys have used Greenlines, quality-wise seems to be a little better than Walbikes, but not much. I would think at 48V they would be okay, but hardly an Electra.
It looks like their 36V build does not modify the fork/frame at all and uses v-brakes, and on the 48V I am thinking they are welding on the front and rear disk brake mounts? You can still see the v-brake attachment points on the fork and rear.
It still seems like a decent deal if you do not want to go through the work.
Roughly looks like to build something almost exactly like they are delivering you would go with:
- Greenline BC-206: $200
- MXUS 500W kit with disc brake wheel, controller, etc: $375 shipped
- Avid BB7 disc brakes front and rear, $50 each with rotors: $100 shipped
- Front wheel with disc brake hub: $50
- Ping 48V 15AH pack with 5A charger: $686 shipped
- Custom welded disc brake mounts (assuming you cannot weld yourself): $100
- Cycle Analyst: $135
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$1646 (plus other odds and ends surely to come up)
Of course, you can save a lot by going with the faster wind Yescom kit, lipo batteries, and a used 7 speed cruiser off Craigslist (I got my bike shop quality Schwinn for $50), but I was just trying to go apples-apples here...