This heavy duty single speed hub was made for those serious riders who are looking for both simplicity and strength in one attractive package. Also, having dual compatibility (fits both 12mm and 14mm dropouts) is always a plus too. The Excelerant RS-1214 rear disc brake hub has not just 2 but 4 sealed bearings to bring that stable and smooth action we all need and love. This cromoly 14mm bolt on axle was designed for strength and the oversized aluminum hub shell for superior durability and stiffness. With the simplicity of a single speed and the strength of a 14mm axle, it will be hard to find something that's in the same ballpark as our RS-1214. New for this year are the 36 flanged hole option and the powder-coated white option.