FSA's Pro Road Chainrings are the ideal replacement inner and outer rings for cranksets with a BCD (bolt circle diameter) of 110 millimeters or 130 millimeters. Machined from AL7075-T6, they are ramped and pinned by the shift-obsessed engineers at FSA to ensure that shifting is precise and smooth with no chain suck. Cause chain suck, well, it sucks. The outer rings feature stainless steel pins for corrosion resistance, and both inner and outer rings accommodate five bolt spiders for compatibility with SRAM and Shimano. The FSA Pro Road Chainrings are compatible with Shimano and SRAM 11 and 10-speed drivetrains, and are available in 110 mm BCD in sizes 36t, 46t, 50t, and 52t, and 130 mm BCD in sizes 39t and 53t in the color Black.