$100 shipped with PP Friends and Family, or $105 for seller protection.

Vision Trimax Aero Brake Caliper (New, never installed)
Ultegra 6810 Direct Mount REAR Brake Caliper (Used, less than 50miles on it. Does not work with new Power Meter on my bike)

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just your average age grouper . no one special . no scientific knowledge . just having fun.