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 C-series is available in two mirror sizes, a 50mm and a 70mm diameter. They both provide a very similar view but the larger mirror achieves a larger image that makes it the easiest to use. 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. Email photos of your setup if you have any questions.