What I read was that the scandium allows 7000 series aluminum to be welded. It's a much stronger alloy than what's normally used, but can't welded. Adding SC allows it to be welded.
The frame is $300 + $50 shipping on ebay. - http://www.ebay.com/itm/170783654295?_t ... 97.c0.m619
And it's an XL - so plenty of room for batteries!!
This would be for what would eventually be a 24s 20ah bike + a large hub motor. For a 50 mph commuter build with 20" tires. But I'm worried because the reviews say it's very flexy and noodle like.
Another option is a 2010 hardrock disc that is a 23" frame. FREAKING MASSIVE. TONS OF ROOM FOR BATTERIES. $300 and local.
I just want some suspension so I'm not bouncing around on rough roads. but I also want lots of room in the triangle for batteries. trade off trade offs