What you know about 80's bikes... I had Dyno, GT, Diamondback, Mongoose, Redline, Haro... not the Walmart shits of today... these were the originals..
I used to change bikes like people change shoes.. my parents were not rich.. I got them in yard sales from rich white kids that couldn't change a flat tire.... I got a Pair of Dyno's onetime for like $15.00 cause their dad was a cop and thought they were junk cause they had flat tires (stupid yes, but totally true).... bikes were like new... I gave one to my little brother...
I used to buy them fix them up ride them then sell them and buy another... pretty good hustle when I was a kid.. made good money... should have kept them... their on eBay now going for hundreds....