Slingshot, engage: Road-worn 1988 Suzuki GSX-R 750
Slingshot Gixxers have gained value over the last couple years on the strength of their reputation as basically the earliest available fully modern street legal sportbike. Short of an astronomically expensive RC30, a late ’80s GSX-R is about as close as you’ll get to a vintage bike that rides like something from this century. Beyond…