Fuel Motorcycles' BMW R100 RS street tracker

One of the most interesting new European custom builders is Karles Vives of Fuel Bespoke Motorcycles. He’s based in Barcelona, Spain, and is entirely self-taught. He’s also got an excellent eye for aesthetics. This is the second BMW R100-based build from Fuel. (Here's the first.) And this time, Vives has taken elements of flat track bikes as his inspiration: “Light, thin and powerful motorcycles with wide handlebars and big air filters,” he says. He’s changed the entire back end of the bike, and worked with VonZeti to create a new seat and tail unit—shortening the subframe to fit. The tank...