Shimano Dura Ace FC-7800, 54t, 54-A Chainring54 Teeth (54T) A large ring for high speeds. Type: SG X (Shimano Gear X) & Hyperdrive Advanced shifting technology. (Bolt Circle Diameter): 130mm Technology: Hollowglide (hollow construction for weight saving stiffness). Purpose: Ideal for time trials, triathlons, or aggressive road racing. A Type: Specific tooth profiling for best performance with a designated inner ring
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