The SRAM Apex brake calipers feature Red inspired performance at a value price. The forged alloy calipers feature a jet black, gloss finish for both looks and performance. The dual pivot design and SRAM/Swiss stop brake pads give excellent stopping power.The Apex calipers have a complete quiver of features including an external centering adjustment, quick release, convex washers, and a barrel adjuster for on the fly adjustment. They are compatible with 28c tires.