There is a term for cyclist that applies to those of us who ride that are obsessed with getting a bike as light as it can get. They are called weight weenies. Well, for you weight weenies out there, meet your watch. Zenith is releasing a limited run of their El Primero Chronograph that tips the scales at a mere 15.9 grams. That is a bit over 1/2 an ounce, or to put it in another context, about 3 seedless grapes.