Bill Costello's immaculate BMW R100RT custom

Four years ago, Bill Costello became a big name in the classic BMW world. He’d restored a 1958 BMW R50 as a tribute to his father, and before he knew it, the bike was on the cover of three magazines. Bill was even flown to Germany to meet BMW’s top brass. “Then people started asking me about my next project,” says Bill, faced with Second Album Syndrome. And here it is, revealed for the first time—an absolutely beautiful 1981 R100RT. It also serves as Bill’s daily ride. “I'm not one of those people who desires a stable full of motorcycles,...