There’s something magical about a classic 70s BMW airhead: Slightly oddball lines, that remarkable engine, and the promise of fine German engineering. An off-kilter charm, if you like. This BMW R75/5, however, is not quite what it seems. It’s a subtly modified 1972 model that has been customized during a ground-up rebuild. And it looks as fresh as the day it rolled out of the BMW Motorrad Werk factory in Berlin.