We believe in mirrors like we believe in bells. Ride with one for a week and you'll never again want to do without. Our R-series is available in two mirror sizes to fit drop bar bikes, a 35mm and a 50mm diameter. They both provide a very similar view but the smaller mirror is more challenging to use, a tradeoff for the sake of minimal form. We consider the R35 our "pro" (vanity) mirror and the R50 our everyday touring model. Designed to complement a modern drop bar bicycle. Not compatible with extreme bar geometries or positions. Some Enve bars and others without standard bar plugs also may not work. Our C-series is available in two mirror sizes, a 50mm and a 70mm diameter. They both provide a very similar view but the smaller mirror shrinks the image a little to achieve a more trimmed down overall form. Designed with "city" bikes in mind. Not for drop bars. Requires access to the bar end, which might require grip modification. Not compatible with full sweep bars.