The Shimano Saint M810-2 Crankset is designed for two chainrings and a bashguard. The plated aluminum rings are 36/22. The rings are pinned, ramped, and profiled for better shifting. The bashguard is made from resin. The bolt circle diameter is 104/64mm. The chainline is 50mm. Shimano recommends their Super Narrow HG 9-speed chain with the chain rings. The crankarms utilize Hollowtech II technology.