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- Time trial rings with added reinforcement for strength and special graphics on the outer ring
- 7075-T6 aluminum with Black hard anodized finish (2012+ replaces tga tungsten grey) and timed ramps/pins for optimized shifting performance
- 130 mm bolt circle diameter
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SRAM Aero Chainrings come as 53,54 and 55 tooth outer rings; plus a corresponding 42 tooth inner ring (not pictured). Powered by the world’s best time trialists the past two seasons these intricately finished PowerGlide rings are vertically, strong, stiff and aero with bold 3X SRAM laser-etched, tungsten gray graphics that look wicked fast. SRAM Aero PowerGlide chain rings are optimized for SRAM 42 tooth Inner rings