Revolights Skyline Bicycle Lighting System, 700c/27-Inch Voted "The Best Bike Lighting System in the World" by Men's Journal Magazine A forward projecting headlight in front and smart brake light in rear which blinks to indicate to traffic when you are slowing down Light is visible from 360 Degree increasing visibility from all angles of approach Weather-resistant design stands up to wet road conditions Fits up to 42mm rim + nipple depth, tires up to 38mm in width