All-City 6-Bolt Disc Bicycle Front Hubs
About All-City - "All-City's goal is to make a significant contribution to the equipment and culture of urban cycling. This is not a cash in, this is not a fad, this is our life, our love, our community and our dream. We are a company of riders making products for other riders."
This should correspond to the type of brakes you have on the bike.